chore: clean up proto Value code

[muktihari]

• Update (Value) SliceBool code documentation: []bool into []typedef.Bool
• Simplify string len counting in proto.Sizeof
• Update switch's cases ordering to match proto Type's constants order for consistency.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (72de0f3) to head (bdc9293).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #435   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           42        42           
  Lines         3669      3658   -11     
=========================================
- Hits          3669      3658   -11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.