[logs] Rename LogRecordProcessor.emit to on_emit

[hectorhdzg]

Description

Rename LogRecordProcessor.emit to on_emit to align with specification
https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/sdk.md#onemit

Fixes #4312

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

[tammy-baylis-swi]

Thanks for another one @hectorhdzg ! I think the API should also be updated.

[hectorhdzg]

Thanks for reviewing @tammy-baylis-swi, I looked into the API as well, Logger "emit" is actually the expected method name, on_emit is only applicable to LogRecordProcessors, I could be missing something though.

[lzchen]

Thanks for reviewing @tammy-baylis-swi, I looked into the API as well, Logger "emit" is actually the expected method name, on_emit is only applicable to LogRecordProcessors, I could be missing something though.

I believe this is correct.