gsb http proxy improvements

[x] should not always return a stream, return what is requested based on accept header
- use GSB streaming only if request accepts streamed response
- use GSB non-streaming otherwise
[ ] allow accept encoding (remove from ignored headers list)
[ ] return http response headers
[ ] remove unwrap()s
[x] hide gsb-binding in component
[ ] support for other http methods (not only GET, POST)
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### Tasks
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golemfactory / ya-runtime-ai