Increase CRDT Counter in local change

[cozitive]

What this PR does / why we need it:
When changing value of Counter through calling increase(), local value in Document.doc is not updated. The problem was hidden because Document.clone and remote value has been updated normally.

Which issue(s) this PR fixes:

Address yorkie-team/yorkie-js-sdk#438

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

Merging #449 (e901127) into main (121b337) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #449      +/-   ##
==========================================
- Coverage   46.48%   46.47%   -0.01%     
==========================================
  Files          70       70              
  Lines        5731     5730       -1     
==========================================
- Hits         2664     2663       -1     
  Misses       2773     2773              
  Partials      294      294              

Impacted Files	Coverage Δ
api/converter/from_pb.go	54.92% <0.00%> (-0.22%)	⬇️
api/converter/to_bytes.go	83.33% <0.00%> (-0.16%)	⬇️
pkg/document/crdt/text.go	60.20% <0.00%> (+0.82%)	⬆️

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[hackerwins]

Thanks for your contribution. 👍