[GraphQL/MovePackage] Query for latest version

## Description

Add a new kind of package point look-up to get the latest version of
the package at a given ID (or from another `MovePackage`). For system
packages, this is analogous to getting the latest version of the
object at that ID, but the versions of other packages all exist at
different IDs.

## Test plan

New transactional tests:

```
sui$ cargo nextest run -p sui-graphql-e2e-tests \
  --features pg_integration                     \
  -- packages/versioning
```

crates/sui-graphql-e2e-tests/tests/packages/versioning.exp

@@ -1,4 +1,4 @@
-processed 9 tasks
+processed 14 tasks
 
 init:
 A: object(0,0)
@@ -8,20 +8,89 @@ created: object(1,0), object(1,1)
 mutated: object(0,0)
 gas summary: computation_cost: 1000000, storage_cost: 5076800, storage_rebate: 0, non_refundable_storage_fee: 0
 
-task 2 'upgrade'. lines 11-15:
-created: object(2,0)
+task 2 'create-checkpoint'. lines 11-11:
+Checkpoint created: 1
+
+task 3 'run-graphql'. lines 13-21:
+Response: {
+ "data": {
+ "latestPackage": {
+ "version": 1,
+ "module": {
+ "functions": {
+ "nodes": [
+ {
+ "name": "f"
+ }
+ ]
+ }
+ }
+ }
+ }
+}
+
+task 4 'upgrade'. lines 23-27:
+created: object(4,0)
 mutated: object(0,0), object(1,1)
 gas summary: computation_cost: 1000000, storage_cost: 5251600, storage_rebate: 2595780, non_refundable_storage_fee: 26220
 
-task 3 'upgrade'. lines 17-22:
-created: object(3,0)
+task 5 'create-checkpoint'. lines 29-29:
+Checkpoint created: 2
+
+task 6 'run-graphql'. lines 31-39:
+Response: {
+ "data": {
+ "latestPackage": {
+ "version": 2,
+ "module": {
+ "functions": {
+ "nodes": [
+ {
+ "name": "f"
+ },
+ {
+ "name": "g"
+ }
+ ]
+ }
+ }
+ }
+ }
+}
+
+task 7 'upgrade'. lines 41-46:
+created: object(7,0)
 mutated: object(0,0), object(1,1)
 gas summary: computation_cost: 1000000, storage_cost: 5426400, storage_rebate: 2595780, non_refundable_storage_fee: 26220
 
-task 4 'create-checkpoint'. lines 24-24:
-Checkpoint created: 1
+task 8 'create-checkpoint'. lines 48-48:
+Checkpoint created: 3
+
+task 9 'run-graphql'. lines 50-58:
+Response: {
+ "data": {
+ "latestPackage": {
+ "version": 3,
+ "module": {
+ "functions": {
+ "nodes": [
+ {
+ "name": "f"
+ },
+ {
+ "name": "g"
+ },
+ {
+ "name": "h"
+ }
+ ]
+ }
+ }
+ }
+ }
+}
 
-task 5 'run-graphql'. lines 26-45:
+task 10 'run-graphql'. lines 60-97:
 Response: {
  "data": {
  "v1": {
@@ -33,6 +102,23 @@ Response: {
  }
  ]
  }
+ },
+ "latest": {
+ "module": {
+ "functions": {
+ "nodes": [
+ {
+ "name": "f"
+ },
+ {
+ "name": "g"
+ },
+ {
+ "name": "h"
+ }
+ ]
+ }
+ }
  }
  },
  "v2": {
@@ -47,6 +133,23 @@ Response: {
  }
  ]
  }
+ },
+ "latest": {
+ "module": {
+ "functions": {
+ "nodes": [
+ {
+ "name": "f"
+ },
+ {
+ "name": "g"
+ },
+ {
+ "name": "h"
+ }
+ ]
+ }
+ }
  }
  },
  "v3": {
@@ -64,12 +167,29 @@ Response: {
  }
  ]
  }
+ },
+ "latest": {
+ "module": {
+ "functions": {
+ "nodes": [
+ {
+ "name": "f"
+ },
+ {
+ "name": "g"
+ },
+ {
+ "name": "h"
+ }
+ ]
+ }
+ }
  }
  }
  }
 }
 
-task 6 'run-graphql'. lines 47-84:
+task 11 'run-graphql'. lines 99-136:
 Response: {
  "data": {
  "v1_from_p1": {
@@ -159,7 +279,7 @@ Response: {
  }
 }
 
-task 7 'run-graphql'. lines 86-141:
+task 12 'run-graphql'. lines 138-193:
 Response: {
  "data": {
  "v1": {
@@ -297,7 +417,7 @@ Response: {
  }
 }
 
-task 8 'run-graphql'. lines 143-171:
+task 13 'run-graphql'. lines 195-223:
 Response: {
  "data": {
  "v0": null,

crates/sui-graphql-e2e-tests/tests/packages/versioning.move

@@ -8,12 +8,36 @@ module P0::m {
  public fun f(): u64 { 42 }
 }
 
+//# create-checkpoint
+
+//# run-graphql
+{
+ latestPackage(address: "@{P0}") {
+ version
+ module(name: "m") {
+ functions { nodes { name } }
+ }
+ }
+}
+
 //# upgrade --package P0 --upgrade-capability 1,1 --sender A
 module P1::m {
  public fun f(): u64 { 42 }
  public fun g(): u64 { 43 }
 }
 
+//# create-checkpoint
+
+//# run-graphql
+{
+ latestPackage(address: "@{P0}") {
+ version
+ module(name: "m") {
+ functions { nodes { name } }
+ }
+ }
+}
+
 //# upgrade --package P1 --upgrade-capability 1,1 --sender A
 module P2::m {
  public fun f(): u64 { 42 }
@@ -23,24 +47,52 @@ module P2::m {
 
 //# create-checkpoint
 
+//# run-graphql
+{
+ latestPackage(address: "@{P0}") {
+ version
+ module(name: "m") {
+ functions { nodes { name } }
+ }
+ }
+}
+
 //# run-graphql
 { # Test fetching by ID
  v1: package(address: "@{P0}") {
  module(name: "m") {
  functions { nodes { name } }
  }
+
+ latest {
+ module(name: "m") {
+ functions { nodes { name } }
+ }
+ }
  }
 
  v2: package(address: "@{P1}") {
  module(name: "m") {
  functions { nodes { name } }
  }
+
+ latest {
+ module(name: "m") {
+ functions { nodes { name } }
+ }
+ }
  }
 
  v3: package(address: "@{P2}") {
  module(name: "m") {
  functions { nodes { name } }
  }
+
+ latest {
+ module(name: "m") {
+ functions { nodes { name } }
+ }
+ }
  }
 }
 

crates/sui-graphql-rpc/schema/current_progress_schema.graphql

@@ -2014,6 +2014,11 @@ type MovePackage implements IObject & IOwner {
  """
  atVersion(version: Int!): MovePackage
  """
+ Fetch the latest version of this package (the package with the highest `version` that shares
+ this packages's original ID)
+ """
+ latest: MovePackage!
+ """
  A representation of the module called `name` in this package, including the
  structs and functions it defines.
  """
@@ -2874,6 +2879,13 @@ type Query {
  """
  package(address: SuiAddress!, version: Int): MovePackage
  """
+ The latest version of the package at `address`.
+ 
+ This corresponds to the package with the highest `version` that shares its original ID with
+ the package at `address`.
+ """
+ latestPackage(address: SuiAddress!): MovePackage
+ """
  Look-up an Account by its SuiAddress.
  """
  address(address: SuiAddress!): Address