Include tracing_stackdriver layer to format logs for GCP

[Pessina]

This PR includes the tracing-stackdriver layer to format the logs for GCP so we can apply custom filters on the data.

Related ticket: #795

[volovyks]

@Pessina I guess the only way to check it is to merge it. Have you done any kind of testing?

[Pessina]

@volovyks I created a demo repo to test it and check the logs output.

This is the new format with the added stackdriver layer:

2024-08-06T07:35:04.149541Z  INFO ThreadId(01) main: tracing_sandbox: User logged in
{"time":"2024-08-06T07:35:04.1496Z","target":"tracing_sandbox","logging.googleapis.com/sourceLocation":{"file":"src/main.rs","line":"29"},"span":{"name":"main"},"spans":[{"name":"main"}],"severity":"INFO","message":"User logged in"}

2024-08-06T07:35:04.149734Z DEBUG ThreadId(01) main: tracing_sandbox: User session created
{"time":"2024-08-06T07:35:04.149743Z","target":"tracing_sandbox","logging.googleapis.com/sourceLocation":{"file":"src/main.rs","line":"30"},"span":{"name":"main"},"spans":[{"name":"main"}],"severity":"DEBUG","message":"User session created"}

2024-08-06T07:35:04.149766Z  WARN ThreadId(01) main: tracing_sandbox: Some warning
{"time":"2024-08-06T07:35:04.149772Z","target":"tracing_sandbox","logging.googleapis.com/sourceLocation":{"file":"src/main.rs","line":"31"},"span":{"name":"main"},"spans":[{"name":"main"}],"severity":"WARNING","message":"Some warning"}

2024-08-06T07:35:04.149791Z ERROR ThreadId(01) main: tracing_sandbox: Critical operation failed
{"time":"2024-08-06T07:35:04.149796Z","target":"tracing_sandbox","logging.googleapis.com/sourceLocation":{"file":"src/main.rs","line":"32"},"span":{"name":"main"},"spans":[{"name":"main"}],"severity":"ERROR","message":"Critical operation failed"}

But as I can't run on MPC i didn't tested there.

[volovyks]

@Pessina ok, let's test it in real env.

[ChaoticTempest]

we should be putting this formatter inside the is_running_on_gcp() call only because now for testing, every other log is showing these extra lines which is going to get annoying