feat: opentelemetry sdk LoggerProvider

[yuzurihaaa]

Which problem is this PR solving?

1. To add LoggerProvider in SDK.
2. This is from Log SDK PR but broken down to be smaller. This PR only for LoggerProvider and related parameters to ease review.

How Has This Been Tested?

1. Unit test

Checklist:

• Unit tests have been added
• Documentation has been updated

[yuzurihaaa]

Hi @blakeroberts-wk , I saw that you've resolve some of the comments, but there are still some that are not resolved but I didn't see any feedback / response.

[yuzurihaaa]

Currently failed on dart v2 but not on v3
> warning - lib/src/sdk/logs/logger_provider.dart:78:5 - Assignment to a variable of type 'void'. Try removing the assignment or changing the type of the variable. - void_checks
warning - lib/src/sdk/logs/logger_provider.dart:82:5 - Assignment to a variable of type 'void'. Try removing the assignment or changing the type of the variable. - void_checks

I'll look into this once review process is done.

After changed the return type to void this is no an issue.

[yuzurihaaa]

Hi @blakeroberts-wk , been a while. Can I know if there are any issues that can be resolved. There are also issues that I need some help :)

[blakeroberts-wk]

In this case, I'm not sure it makes sense to follow either of those implementations. I imagine the designs above are due to legacy reasons or oversight. We should support multiple processors. Those other implementations accomplish this by introducing a MultiLogRecordProcessor. As far as I can tell, this is superfluous complexity. A logger provider should have a list of processors given to a logger during instantiation. This implementation follows the same lines as other providers (meter and tracer).

https://opentelemetry.io/docs/specs/otel/logs/sdk/#logrecordprocessor

[yuzurihaaa]

Requesting for review on #207 (comment)

[yuzurihaaa]

hi @blakeroberts-wk . Can I get some feedback on #207 (comment) if I got this right?

[yuzurihaaa]

hi @blakeroberts-wk , can I know if there's any update? Or @evanweible-wf can help on the reviewing process?

[yuzurihaaa]

Hi @robbecker-wf . Sorry that I missed your message, I've added the changes from review.

[yuzurihaaa]

Hi @blakeroberts-wk , anything else that is pending from me to fix? In case if I missed something out.