Add Tree.Edit benchmark and improve performance

[7hong13]

What this PR does / why we need it?

Added benchmark tests based on the JS SDK.
(I didn't include tests related to GC since I'm unsure whether exposing garbageCollect() and garbageLength to the public only for benchmark tests is acceptable. I’ll consider the proper way to handle it.)

Any background context you want to provide?

I'll change the base branch to main after gc is merged.

What are the relevant tickets?

• Add Tree.Edit benchmark and improve performance yorkie-js-sdk#641

Fixes #

Checklist

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

[hackerwins]

Thanks for your contribution.

[skhugh]

I didn't include tests related to GC since I'm unsure whether exposing garbageCollect() and garbageLength to the public only for benchmark tests is acceptable.

there is VisibleForTesting annotation for exactly for such use-cases.

[7hong13]

I added the omitted tests for GC using VisibleForTesting in 423d169.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (d244681) 78.22% compared to head (ced2773) 78.22%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #137   +/-   ##
=======================================
  Coverage   78.22%   78.22%           
=======================================
  Files          63       63           
  Lines        3678     3679    +1     
  Branches      573      573           
=======================================
+ Hits         2877     2878    +1     
  Misses        503      503           
  Partials      298      298           

Files	Coverage Δ
...ie/src/main/kotlin/dev/yorkie/document/Document.kt	70.55% <ø> (ø)
...c/main/kotlin/dev/yorkie/document/crdt/CrdtTree.kt	82.05% <100.00%> (+0.05%)	⬆️
...lin/dev/yorkie/document/crdt/CrdtTreeExtensions.kt	100.00% <100.00%> (ø)
...main/kotlin/dev/yorkie/document/time/TimeTicket.kt	94.11% <100.00%> (ø)

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