chore: made fast UUID to internal

[kotharironak]

Addressing follow up comments: #49 (comment)

[github-actions]

Test Results

70 tests  ±0   70 ✔️ ±0   18s ⏱️ +2s
12 suites ±0     0 💤 ±0 
12 files   ±0     0 ❌ ±0 

Results for commit e6e9399. ± Comparison against base commit c303dc0.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

Merging #50 (e6e9399) into main (c303dc0) will not change coverage.
The diff coverage is 0.00%.

@@            Coverage Diff            @@
##               main      #50   +/-   ##
=========================================
  Coverage     74.88%   74.88%           
  Complexity      146      146           
=========================================
  Files            21       21           
  Lines           418      418           
  Branches         22       22           
=========================================
  Hits            313      313           
  Misses           86       86           
  Partials         19       19           

Flag	Coverage Δ
unit	74.88% <0.00%> (ø)

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Files Changed	Coverage Δ
...race/core/grpcutils/context/FastUUIDGenerator.java	87.50% <0.00%> (ø)

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