feat(consensus): HeaviestSubtreeForkChoice (#505)

* Init dir structure

* Added basic data structures

* temp

* Should be able to create from root

* Fix style

* Fmt

* Renamed new to init

* Make sure to walk up the tree when propagating the best slot

* Added containsBlock

* Add bestOverallSlot

* Todo

* Added subtreeDiff

* Added HeaviestSubtreeForkChoice.setTreeRoot

* Update subtreeDiff to return SortedMap

* Fix style

* Include call to propagateNewLeaf

* Add some documentation with some ascii arts.

* Added implementation for markForkInvalidCandidate

* Fix compilation

* Switch to SlotAndHash

* Use struct name for annotating self

* Added initForTest for testing

* Fix leak

* Testing HeaviestSubtreeForkChoice.testSetRoot

* Fix subtreeDiff

* Fix selecting of root in initForTest

* Deinit children when removing from fork_infos

* Added test for HeaviestSubtreeForkChoice.subtreeDiff

* Added tests for HeaviestSubtreeForkChoice.ancestorIterator

* Added test for HeaviestSubtreeForkChoice.testBestOverallSlot

* Document the test tree structure

* Added test for HeaviestSubtreeForkChoice.aggregateSlot

* Added deepestSlot and extended HeaviestSubtreeForkChoice.aggregateSlot

* Added stakeVotedAt

* Add setStakeVotedAt to use in test

* Extended Test

* Add deepestOverallSlot

* Completed HeaviestSubtreeForkChoice.aggregateSlot

* Added test for HeaviestSubtreeForkChoice.isBestChild

* Added setupDuplicateForks

* Added test HeaviestSubtreeForkChoice.addNewLeafSlot_duplicate

* Add isDuplicateConfirmed

* Implemented markForkValidCandidate

* Rename latest_invalid_ancestor to latestInvalidAncestor

* Added HeaviestSubtreeForkChoice.markForkValidCandidate

* Move test fork into a variable

* Added test HeaviestSubtreeForkChoice.markForkValidandidate_mark_valid_then_ancestor_invalid

* Remove placeholder tests

* Make bestOverallSlot not returning a value an error case

* Switch to logger

* Remove processed todo comment

* Made some methods that does not need to be public private

* Documented addNewLeafSlot

* Document propagateNewLeaf

* Document isDeepestChild

* Have impl of bestOverallSlot uniform with deepestOverallSlot

* Document setTreeRoot

* Added new line between fields and methods

* Use equals instead of order for equality check

* Improve variable names

* Renaming and documentation

* use self

* Use sig.time.Duration

* Rename HeaviestSubtreeForkChoice to just ForkChoice

* Panic if node to be removed not found

* Panic if new root is not found in fork infos

* Updated comment

* Have doInsertAggregateOperation as a standalone function

* Added github issue

* Removed MAX_ROOT_PRINT_SECONDS as it is not being used

* Fix link

* Replace errors with panic when slot not found in fork choice

* Removed the need for alloc. Instead check contains first

* Do not panic in markForkValidCandidate

* Improve comment

* refactor(svm): refactor transaction implementation  (#513)

* Transaction refactor

* replace transaction builder

* Removed CheckedReader

* remove nullability from address lookups

* Address PR comments

* implement serialize

* restore transaction unit tests

* missed test case

* address comments

* Address PR comments

* fix type issue

* Extract signable component into message

* add clone test

* Renamed latest_invalid_ancestor to latest_duplicate_ancestor

* Remove setting void to _

* Fix docs

* Use while on optional

* Simplify early return check

* Simplify struct deconstruction

* Pass UpdateOperations by ref

* Rename slotAndHashes to slot_and_hashes

* Move initForTest to a standalone utility function

* Use std.testing.expectEqual

* Use std.testing.expectEqual in more places

* Have the expect as the first parameter

* More std.testing.expectEqual

* Added HeaviestSubtreeForkChoice.propagateNewLeaf

* Change how the fork choice tree is represented in comments

* Rename remaining occurance of best to heaviest

* Comment with links to corresponding parts in Agave

* Comment test with links to corresponding tests in Agave

* Comment with links to corresponding parts in Agave

* use doc comments to document struct fields

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Co-authored-by: x19 <100000306+0xNineteen@users.noreply.github.com>
Co-authored-by: Harold <41681731+yewman@users.noreply.github.com>