feat/balance api OM-573 (#938)

* fix(deps): roll back kin-openapi for oapi-codegen compatibility

* chore(*): pin kin-openapi version

* feat(entitlements): clean up balance calculation API types

* feat(entitlements): add better errors for feature creation

* feat(entitlements/balance): add output mappings to balance API

* fix(entitlements/api): handle empty list returns

* style: fix lint errors

* fix(e2e): fix nil value parsing

* feat(entitlements): add option to include voids in grant apis

* feat(entitlements): add void property to grant response schema

* feat(entitlements): extend history API and validate feature name uniqueness among active

* fix(entitlements/history): change API required fields

* refactor(api): create new type for grant return endpoint

* fix(*): address PR comments

* fix(ci): fix e2e and lint

* refactor(api): standardise use of LedgerBalanceGrant

* fix(*): address PR comments

* fix: use convert package

* Update api/openapi.yaml

Co-authored-by: András Tóth <4157749+tothandras@users.noreply.github.com>
Signed-off-by: Alex Goth <64845621+GAlexIHU@users.noreply.github.com>

---------

Signed-off-by: Alex Goth <64845621+GAlexIHU@users.noreply.github.com>
Co-authored-by: András Tóth <4157749+tothandras@users.noreply.github.com>

.vscode/default.code-workspace

@@ -0,0 +1,12 @@
+{
+    "folders": [
+        {
+            "name": "root",
+            "path": "../"
+        },
+        {
+            "name": "ci",
+            "path": "../ci"
+        }
+    ]
+}

.vscode/launch.json

@@ -1,18 +1,16 @@
 {
-    // Use IntelliSense to learn about possible attributes.
-    // Hover to view descriptions of existing attributes.
-    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    "version": "0.2.0",
-    "configurations": [
-        {
-            "name": "Launch Server",
-            "type": "go",
-            "request": "launch",
-            "mode": "auto",
-            "program": "${workspaceFolder}/cmd/server",
-            "args": [
-                "--config", "${workspaceFolder}/config.example.yaml",
-            ]
-        }
-    ]
-}
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "Launch Server",
+      "type": "go",
+      "request": "launch",
+      "mode": "auto",
+      "program": "${workspaceFolder}/cmd/server",
+      "args": ["--config", "${workspaceFolder}/config.example.yaml"]
+    }
+  ]
+}