feat: simplify generated open api structure and manual overrides

[patzick]

Description

Draft of incoming generator changes. More detailed description will show up here soon.

Type of change

For canary - breaking but simplifying, migration path will be provided. For stable - breaking but more simple than current stable->canary transition.

ToDo's

• [x] test and generate query params
• [x] test and generate path params
• [x] test and generate headers
• [ ] (optional) override only part of schema/operation
• [x] rewrite RequestParameters and RequestReturnType
• [ ] migrate creating admin client
• [ ] ...

[vercel[bot]]

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[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #871 will degrade performances by 90.97%

_{Comparing feat/api-client-new-structure (70af765) with main (9ce8d65)}

Summary

❌ 4 (👁 4) regressions ✅ 5 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	feat/api-client-new-structure	Change
👁	[api-client][transformPathToQuery] - transform with header params	61.7 µs	77.9 µs	-20.7%
👁	[api-client][transformPathToQuery] - transform with path,query,body,header params	84.6 µs	280.2 µs	-69.81%
👁	[api-client][transformPathToQuery] - transform with query params	62.3 µs	69.8 µs	-10.63%
👁	[api-gen][generate] - generate schema command	412.3 ms	4,566.7 ms	-90.97%