feat: introduce `Api.Route` extensions #11672

Job	Run time
Validate commit messages	7s
Create constants	13s
Static code analysis (TypeScript)	1m 42s
Validate commit messages (dev branch, 'feat' commits not allowed)	0s
Build	2m 25s
Static code analysis	2m 24s
Vitest (DDB) - Constants	8s
Vitest (No storage) - Constants	7s
Vitest (DDB+OS) - Constants	7s
Static code analysis (verify dependencies)	1m 56s
handler	2m 2s
matrix.testCommand.title	0s
matrix.testCommand.title	0s
	11m 11s

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