[Proposal] Extract basic packages for otlp exporters

[meteorlxy]

The current dependency graph of otlp exporters does not look reasonable:

• All the metrics exporters are depending on its corresponding trace exporter.
• All the exporter packages are depending on exporter-trace-otlp-http package.

Here I propose to extract some basic packages to make the structure better:

I.e., add some base packages.

Those base packages are "abstract packages", users could not use them directly. Those packages are only used to be extended from. It should also be helpful when we have exporter-logs-otlp-xxx in the future.

If this proposal is going to be accepted, I could open a PR for it. In fact, I've already started trying to refactor them, but it will affect at least 10 packages, so I think it's better to open an issue and ask for comments first.

BTW, any suggestions about the naming of those packages?

[vmarchaud]

We discussed in the past that it might be better to refactor those packages so this is more than welcome, i don't see an issue with your proposal and looking for your PR :)

BTW, any suggestions about the naming of those packages?

We already discussed on the naming for package that will be consumed by users so those won't changes, apart from base package names are fine

[github-actions]

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[dyladan]

@legendecas you linked my PR to this but I don't believe my PR fully addresses this but is really just a prerequisite

[legendecas]

@dyladan sorry about miscategorization. please feel free to remove the link.

[pichlermarc]

Ah looks like I missed this issue back then. Done in #2893 🙂