Add ability to configure proxy

[IgorChvyrov-sm]

Changes:

Updated sync API client to enable proxy configuration
Updated config to make it possible to set proxy via env vars
Added proxy section to README.md
Added examples with proxy configuration

[codecov]

Codecov Report

❌ Patch coverage is 73.07692% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/conductor/client/adapters/rest_adapter.py	62.50%	9 Missing ⚠️
...ctor/asyncio_client/configuration/configuration.py	42.85%	4 Missing ⚠️
...rc/conductor/client/configuration/configuration.py	95.23%	1 Missing ⚠️

Files with missing lines	Coverage Δ
...rc/conductor/client/configuration/configuration.py	90.65% <95.23%> (+0.43%)	⬆️
...ctor/asyncio_client/configuration/configuration.py	97.67% <42.85%> (-2.33%)	⬇️
src/conductor/client/adapters/rest_adapter.py	92.96% <62.50%> (-7.04%)	⬇️

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[nthmost-orkes]

This looks great except for one little thing -- CONDUCTOR_PROXY_HEADERS has several tests around it while CONDUCTOR_PROXY has zero (apparently?).

We should have at least one test around this variable to protect it, i.e. make it more obvious when we might be about to do a release that changes something about how the SDK is operated.

[IgorChvyrov-sm]

This looks great except for one little thing -- CONDUCTOR_PROXY_HEADERS has several tests around it while CONDUCTOR_PROXY has zero (apparently?).

We should have at least one test around this variable to protect it, i.e. make it more obvious when we might be about to do a release that changes something about how the SDK is operated.

Sure, just missed that. Thanks for notice -- done

[nthmost-orkes]

Nice, thank you for the updates!