feat: finalize logger

[yuzurihaaa]

Which problem is this PR solving?

1. Continuation of feat: otlp logger exporter #212
2. Mark Log as Beta

Fixes # (issue)
close #172

Short description of the change

1. Change from experimental_api/sdk to api/sdk.
2. Update README

How Has This Been Tested?

N/A

Checklist:

• Unit tests have been added
• Documentation has been updated

[tigloo]

Is any help needed to finish the logging PRs? We would really like to see the logging feature included in the package, as it would allow us to move completely over to Open Telemetry.

[yuzurihaaa]

Hi @tigloo , all the PRs here https://github.com/Workiva/opentelemetry-dart/pulls/yuzurihaaa just with help on fixing the reviews or even help by reviewing the PRs, that would be helpful to get this completed fast 😄

I am trying my best to get this completed too because I am doing some extra package for offline first logs https://github.com/feedmepos/offline-otlp-log-exporter

[jodinathan]

is the branch working or is there anything else to do?

would be very nice to have this in the package!

[yuzurihaaa]

@jodinathan afaik, the branch is working, but it is behind changes after review from the other branches. Do try it out and if u happens to stumble into any issue, let me know.

update: I've rebased with the changes from previous branches, but have yet to try it out into any logging services.