perf: make functions common for reduce code size

[yusukebe]

This PR reduces the bundle code size with common functions that can't be minified with the bundler.

Created the following functions:

• createEmptyRecord
• createResponse

And applied to the core files. I think we don't have to optimize unrelated to the core like under src/middleware now.

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.66%. Comparing base (c277c75) to head (4b49a9d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4111      +/-   ##
==========================================
+ Coverage   91.34%   91.66%   +0.31%     
==========================================
  Files         168      169       +1     
  Lines       10700    10686      -14     
  Branches     3181     3098      -83     
==========================================
+ Hits         9774     9795      +21     
+ Misses        925      890      -35     
  Partials        1        1              

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[github-actions]

Bundle size check

	main (c277c75)	#4111 (117d4ff)	+/-
Bundle Size (B)	18,933B	18,583B	-350B
Bundle Size (KB)	18.49K	18.15K	-0.34K

Compiler Diagnostics

	main (c277c75)	#4111 (117d4ff)	+/-
Files	261	262	1
Lines	116,438	116,450	12
Identifiers	114,433	114,432	-1
Symbols	303,855	303,873	18
Types	214,832	214,834	2
Instantiations	3,091,594	3,091,594	0
Memory used	444,751K	444,586K	-165K
I/O read	0.02s	0.02s	0s
I/O write	0s	0s	0s
Parse time	0.67s	0.68s	0.01s
Bind time	0.28s	0.29s	0.01s
Check time	5.77s	5.62s	-0.15s
Emit time	0s	0s	0s
Total time	6.72s	6.58s	-0.14s

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Reported by octocov