Remove node from index during GC

[raararaara]

What this PR does / why we need it:

Remove node from indexes during GC

While improving GC structure, we missed removing nodes from internal indexes of Text when purging tombstones.

This commit fixes #866.

Which issue(s) this PR fixes:

Addresses https://github.com/yorkie-team/yorkie/issues/914

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

• [x] Added relevant tests or not required
• [x] Didn't break anything

Summary by CodeRabbit

• New Features

  • Added new methods TreeByIndex() and TreeByID() to facilitate debugging.

• Bug Fixes

  • Improved garbage collection to ensure consistent deletion of nodes in internal data structures.

• Tests

  • Introduced a new test case for validating node purges during garbage collection.
  • Added assertions to verify text weight consistency in documents.

[coderabbitai[bot]]

Walkthrough

The changes primarily enhance the RGATreeSplit struct's garbage collection functionality by ensuring nodes are correctly deleted from two index trees. Additionally, debugging capabilities are improved by exposing tree structures through new methods in the Text struct. New tests validate the correct behavior of these modifications.

Changes

Files	Change Summary
pkg/document/crdt/rga_tree_split.go	Modified Purge method to delete nodes from treeByIndex and treeByID trees before adjusting linked list.
pkg/document/crdt/text.go	Added imports for llrb and splay. Introduced TreeByIndex and TreeByID methods for debugging.
pkg/document/document_test.go	Added purge node from index during GC test within TestDocument to validate garbage collection functionality.
test/integration/text_test.go	Added assertions to check the text weight using TreeByIndex.

Assessment Against Linked Issues

Objective (Issue)	Addressed	Explanation
Apply GCPair to TreeNode, TextNode (#866)	✅
Synchronization fails when editing including Undo In the CodeMirror example (#914)	✅

Poem

In the land of code where data flows,
Trees now sway, in perfect rows.
Nodes purged, with precision and care,
Debugging made easy, solutions to share. 🌳
With tests in place, the system's bright,
Sync is smoother, all day and night. ✨

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.

Project coverage is 50.73%. Comparing base (58d45c6) to head (7031160).

Files	Patch %	Lines
pkg/document/crdt/text.go	0.00%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #913 +/- ## ========================================== - Coverage 50.74% 50.73% -0.01% ========================================== Files 70 70 Lines 10551 10558 +7 ========================================== + Hits 5354 5357 +3 - Misses 4666 4670 +4 Partials 531 531 ```

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