Enable http2 for sync client

[IgorChvyrov-sm]

Changes:

Added RESTClientObjectAdapter to use httpx instead of requests
Updated ApiClientAdapter to use RESTClientObjectAdapter

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 4 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...rc/conductor/client/adapters/api_client_adapter.py	50.00%	4 Missing ⚠️

Files with missing lines	Coverage Δ
src/conductor/client/adapters/rest_adapter.py	100.00% <100.00%> (ø)
...rc/conductor/client/adapters/api_client_adapter.py	45.83% <50.00%> (+10.83%)	⬆️

... and 1 file with indirect coverage changes

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