feature: OpenTelemetry plugin support

[howardyoo]

What this PR is about

This PR is for introducing OpenTelemetry (opentelemetry.io) as a mean to export the log messages.
Using this PR, you can export logs into any OpenTelemetry backend of your choice.

[wrt83]

Is this still being considered?

[howardyoo]

Is this still being considered?

I'm still here - waiting for someone to review and approve.

[jongpie]

@howardyoo thanks so much for working on this, and for your patience! I've fallen very behind on reviewing PRs during the last several months, but I'm actively working this week & next week on trying to get caught up on existing PRs, as well as releasing some PRs of my own.

My plan is...

1. This week: Try to again test & review your PR (and hopefully release the plugin)
   • First I'm trying to wrap up a few bugfixes, including PR Bugfix: PrismJS loading improvements & error handling #988
   • I'm also working on setting up a test OTel endpoint so I can test your plugin end-to-end
2. Soon after initially releasing your plugin: I'd like to later combine my (unfinished) changes in PR Added OpenTelemetry REST endpoint for external systems to store logs in Salesforce #767 to add an OTel-compliant RestResource into your plugin.
   • Your plugin's support for sending to OTel endpoints (outbound), combined with a custom REST resource (inbound), would provide bi-directional support for OTel - something I've been wanting to add for a few years now
3. For a few months (at least): continue to iterate on the plugin, based on any feedback/enhancements/bugs reported
4. Eventually: merge the plugin code into Nebula Logger's core package so bi-directional OTel support is available out-of-the-box in both the unlocked & managed packages

I'd love to hear your thoughts on this plan. And I'll let you know as soon as I've finished reviewing/testing