Tracing and Flamegraphs/charts

[anthony-near]

To help identify performance bottlenecks, such as the one identified with /create_account_atomic when deployed, more tracing features have been added. We can now see the time taken for each request to send a response:

2023-11-15T21:15:30.881115Z DEBUG request{method=GET uri=/get_allowance version=HTTP/1.1}: tower_http::trace::on_response: finished processing request latency=27 ms status=200
2023-11-15T21:16:00.230494Z DEBUG request{method=POST uri=/send_meta_tx version=HTTP/1.1}: tower_http::trace::on_response: finished processing request latency=3078 ms status=500
2023-11-15T21:16:32.513769Z DEBUG request{method=POST uri=/create_account_atomic version=HTTP/1.1}: tower_http::trace::on_response: finished processing request latency=2235 ms status=500

• [x] add tracing #[instrument] attribute to each endpoint function and process_signed_delegate_action which enables the request latency in the tracing logs
• [x] support for flamegraph and flamechart generation using the https://crates.io/crates/tracing-flame crate
• [x] updated README with performance testing instrucitons
• [x] changes from https://github.com/near/pagoda-relayer-rs/pull/46 also included