feat(exporters): add support for bytes metrics for logs/traces/metrics

[OverOrion]

Description

For log records it is really useful to know how not only the number of log records but their size in bytes as well. This PR in it's current state showcases a potential solution to this problem, please let me know your thoughts @djaglowski @ChrsMark

I will also make sure that it is disabled by default, but wanted to gather early feedback before went with this further.

Link to tracking issue

Fixes #9412

Testing

Documentation

TODOs:

• [ ] docs
• [ ] testing
• [ ] make sure disabled by default