Add Logs Bridge API

[tigrannajaryan]

edited by @pellared

This work is to be split into multiple PRs to make reviewing more effective:

1. design doc: https://github.com/open-telemetry/opentelemetry-go/pull/4809
2. source code and unit tests (update DESIGN.md to reference the source files)
3. package comments
4. benchmarks (update DESIGN.md to reference the benchmark test file)
5. "alloc" unit tests

[mattsains]

is there anything I can do to help?

[pellared]

https://github.com/open-telemetry/opentelemetry-go/blob/d423bd4cf28f65bdcbd1b1d83d0f59c4388f37b0/README.md#L23-L24

You can help with existing TODO issues related to metrics or help addressing existing bugs.