chore: flush the local tracer every 30s

[rach-id]

This changes help to flush the buffered writer in the file every 30s if not enough updates are happening.

This solves the issue of not seeing any traces when running a stable network

[rootulp]

golangci-lint is complaining

[rootulp]

Note: this PR modifies the function signature of some exported functions in the pkg/trace package so it may technically be considered breaking. NBD if we don't add ! to the PR title though b/c I assume you'll bump to this change in celestia-app and handle the function signature change

[rach-id]

I didn't know it was used in app. Where is it please? @rootulp
If this is used downstream, we can make the change backwards compatible. I thought it's proper to core and it's fine to just change

[rootulp]

I didn't know it was used in app. Where is it please? @rootulp

Oops nvm it isn't used in app. Disregard

[rach-id]

Closing this as I think it's unnecessary. The issue was happening because I was running a small network, only running 2 reactors, and the buffer doesn't receive enough data to write it.

However, in a realistic network, running all reactors, this shouldn't happen.