[META] External plugins - Enhancements

[AlexanderWert]

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In

• https://github.com/elastic/apm-agent-java/issues/937

we covered the first iteration of supporting external plugins.

This issue collects potential further enhancements for the external plugins support:

• [x] https://github.com/elastic/apm-agent-java/issues/2201
• [ ] https://github.com/elastic/apm-agent-java/issues/2200
• [ ] https://github.com/elastic/apm-agent-java/issues/2330

[AlexanderWert]

@jackshirazi Are all of the above sub-issues still relevant, or can we close some of them already?

[jackshirazi]

I would say any refactorings should be driven by the community, so I've closed that. The other two are still valid