Reverse TreeChanges when Deleting in Tree

[humdrum]

What this PR does / why we need it:

• Reverse TreeChanges when Deleting in Tree yorkie-js-sdk#774

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Additional documentation:

Checklist:

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

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 40.77%. Comparing base (cbde6a0) to head (fc09367).

Files	Patch %	Lines
Tests/Integration/TreeIntegrationTests.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #161   +/-   ##
=======================================
  Coverage   40.77%   40.77%           
=======================================
  Files         104      104           
  Lines       17967    17967           
=======================================
  Hits         7326     7326           
  Misses      10641    10641           

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