infra: update file structure for util/internal

[xDivisionByZerox]

Description

• Moved generateMersenne*Randomizers() from src/internal/mersenne.ts functions to the src/utils directory.
• Moved src/utils/types.ts to the src/internal directory.
• Moved src/locale-proxy.ts to src/internal directory.
• Updated the test directory to mimic the new position of files

Closes #2961. Continuation of #2964.

• Move utils to the correct place #2961
• fix: move utils to the correct place #2964

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (424b120) to head (7898018).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3141      +/-   ##
==========================================
- Coverage   99.97%   99.96%   -0.01%     
==========================================
  Files        2776     2777       +1     
  Lines      226341   226342       +1     
  Branches      944      943       -1     
==========================================
- Hits       226275   226273       -2     
- Misses         66       69       +3     

Files with missing lines	Coverage Δ
src/faker.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <ø> (ø)
src/internal/locale-proxy.ts	100.00% <100.00%> (ø)
src/internal/mersenne.ts	94.03% <ø> (-1.05%)	⬇️
src/internal/types.ts	100.00% <ø> (ø)
src/modules/date/index.ts	100.00% <100.00%> (ø)
src/modules/string/index.ts	100.00% <ø> (ø)
src/simple-faker.ts	100.00% <100.00%> (ø)
src/utils/mersenne.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes