[cli] move public C APIs to dedicated cli_api.cpp

[abtink]

This commit moves the public C APIs for the CLI from cli.cpp to a new dedicated file cli_api.cpp.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the codebase organization by decoupling the public C API definitions from the main CLI implementation file. By moving these functions to a dedicated file, the project achieves better modularity and cleaner separation of concerns within the CLI module.

Highlights

• Code Refactoring: Moved all public C API implementations from cli.cpp to a new dedicated file named cli_api.cpp.
• Build System Updates: Updated BUILD.gn, CMakeLists.txt, and radio.cmake to include the new cli_api.cpp file in the build process.

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[gemini-code-assist]

Code Review

This pull request refactors the CLI implementation by moving the public C APIs from cli.cpp into a new dedicated file, cli_api.cpp. Corresponding updates were made to the GN and CMake build files to include the new source file in the build process. I have no feedback to provide.

[github-actions]

Merging #13016 into main

name	branch	text	data	bss	total
ot-cli-ftd	7319d40	483160	860	66548	550568
	89ff964	483160	860	66548	550568
	+/-	+0	+0	+0	+0
ot-ncp-ftd	7319d40	448836	764	61784	511384
	89ff964	448836	764	61784	511384
	+/-	+0	+0	+0	+0
ot-cli-mtd	7319d40	375216	764	50972	426952
	89ff964	375216	764	50972	426952
	+/-	+0	+0	+0	+0
ot-ncp-mtd	7319d40	356164	764	46240	403168
	89ff964	356164	764	46240	403168
	+/-	+0	+0	+0	+0
ot-cli-ftd-br	7319d40	599984	864	136732	737580
	89ff964	600000	864	136732	737596
	+/-	+16	+0	+0	+16
ot-rcp	7319d40	63344	568	20804	84716
	89ff964	63344	568	20804	84716
	+/-	+0	+0	+0	+0

Library files

name	branch	text	data	bss	total
libopenthread-ftd.a	7319d40	251143	95	40327	291565
	89ff964	251143	95	40327	291565
	+/-	+0	+0	+0	+0
libopenthread-cli-ftd.a	7319d40	61833	0	8091	69924
	89ff964	61833	0	8091	69924
	+/-	+0	+0	+0	+0
libopenthread-ncp-ftd.a	7319d40	33511	0	5948	39459
	89ff964	33511	0	5948	39459
	+/-	+0	+0	+0	+0
libopenthread-mtd.a	7319d40	169773	0	24783	194556
	89ff964	169773	0	24783	194556
	+/-	+0	+0	+0	+0
libopenthread-cli-mtd.a	7319d40	41569	0	8059	49628
	89ff964	41569	0	8059	49628
	+/-	+0	+0	+0	+0
libopenthread-ncp-mtd.a	7319d40	25807	0	5948	31755
	89ff964	25807	0	5948	31755
	+/-	+0	+0	+0	+0
libopenthread-ftd-br.a	7319d40	369001	99	110471	479571
	89ff964	369001	99	110471	479571
	+/-	+0	+0	+0	+0
libopenthread-cli-ftd-br.a	7319d40	81040	0	8131	89171
	89ff964	81040	0	8131	89171
	+/-	+0	+0	+0	+0
libopenthread-rcp.a	7319d40	9946	0	5060	15006
	89ff964	9946	0	5060	15006
	+/-	+0	+0	+0	+0
libopenthread-radio.a	7319d40	19939	0	238	20177
	89ff964	19939	0	238	20177
	+/-	+0	+0	+0	+0

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.66%. Comparing base (7319d40) to head (c0f3c79).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cli/cli_api.cpp	25.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13016      +/-   ##
==========================================
+ Coverage   69.01%   72.66%   +3.65%     
==========================================
  Files         695      699       +4     
  Lines       98523    94059    -4464     
==========================================
+ Hits        67992    68347     +355     
+ Misses      30531    25712    -4819     

Files with missing lines	Coverage Δ
src/cli/cli.cpp	64.14% <ø> (+16.12%)	⬆️
src/cli/cli.hpp	75.00% <ø> (ø)
src/cli/cli_api.cpp	25.00% <25.00%> (ø)

... and 114 files with indirect coverage changes

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