refactor(context): simplify "GetType()" functions

[KaymeKaydex]

This PR introduces a generic function, getTyped[T any], to simplify value retrieval in the Context struct. It replaces repetitive type assertions in the GetString and GetBool methods and adds comments to previously uncommented functions.

Benefits:
Reduces Code Duplication: Centralizes type assertions.
Enhances Readability: Simplifies method implementations and improves documentation.

[appleboy]

@KaymeKaydex Please rebase the master branch to start the CI build.

[KaymeKaydex]

@KaymeKaydex Please rebase the master branch to start the CI build.

done

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.93%. Comparing base (3dc1cd6) to head (24db9b2).
Report is 79 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4080      +/-   ##
==========================================
- Coverage   99.21%   98.93%   -0.28%     
==========================================
  Files          42       44       +2     
  Lines        3182     3387     +205     
==========================================
+ Hits         3157     3351     +194     
- Misses         17       25       +8     
- Partials        8       11       +3     

Flag	Coverage Δ
	?
-tags "sonic avx"	98.92% <100.00%> (?)
-tags go_json	98.92% <100.00%> (?)
-tags nomsgpack	98.92% <100.00%> (?)
go-1.18	?
go-1.19	?
go-1.20	?
go-1.21	98.93% <100.00%> (-0.28%)	⬇️
go-1.22	98.93% <100.00%> (?)
macos-latest	98.93% <100.00%> (-0.28%)	⬇️
ubuntu-latest	98.93% <100.00%> (-0.28%)	⬇️

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