Set the Accept-Encoding: gzip header by default for all RPC calls

[WilfredAlmeida]

Motivation

At Triton One, we've observed that by setting the Accept-Encoding: gzip headers, users can enable compression of their response payloads and thus reduce the response payload size

Example use case

For the getProgramAccounts call, we've observed that responses over 150MB were reduced to <60MB

Details

Set the header by default for all RPC calls

[github-actions]

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