Add proxy support

[Jonney]

In the __init__() of solana.rpc.api.Client and solana.rpc.async_api.AsyncClient, a parameter proxy was added, and it is passed to httpx.Client() and httpx.AsyncClient().

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.00%. Comparing base (a5434bc) to head (7feb2e5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #479   +/-   ##
=======================================
  Coverage   92.00%   92.00%           
=======================================
  Files          27       27           
  Lines        2226     2226           
=======================================
  Hits         2048     2048           
  Misses        178      178           

[michaelhly]

Can you also update the doc strings:

solana-py/src/solana/rpc/api.py

Lines 81 to 85 in 98712f3

	Args:
	endpoint: URL of the RPC endpoint.
	commitment: Default bank state to query. It can be either "finalized", "confirmed" or "processed".
	timeout: HTTP request timeout in seconds.
	extra_headers: Extra headers to pass for HTTP request.

solana-py/src/solana/rpc/async_api.py

Lines 79 to 82 in 98712f3

	endpoint: URL of the RPC endpoint.
	commitment: Default bank state to query. It can be either "finalized", "confirmed" or "processed".
	timeout: HTTP request timeout in seconds.
	extra_headers: Extra headers to pass for HTTP request.

[Jonney]

Can you also update the doc strings:

solana-py/src/solana/rpc/api.py

Lines 81 to 85 in 98712f3

	Args:
	endpoint: URL of the RPC endpoint.
	commitment: Default bank state to query. It can be either "finalized", "confirmed" or "processed".
	timeout: HTTP request timeout in seconds.
	extra_headers: Extra headers to pass for HTTP request.

solana-py/src/solana/rpc/async_api.py

Lines 79 to 82 in 98712f3

	endpoint: URL of the RPC endpoint.
	commitment: Default bank state to query. It can be either "finalized", "confirmed" or "processed".
	timeout: HTTP request timeout in seconds.
	extra_headers: Extra headers to pass for HTTP request.

Completed