[WIP] Autogenerate config.go files from Pkl schema

[ptodev]

Description

This is a WIP PR to explore schematising the Collector's config through the Pkl language. Each processor/exporter/receiver/connector would have to have a .pkl file instead of a config.go. The config.go will be automatically generated via the pkl-gen-go command line utility.

The advantages of using Pkl are:

• Schema can be automatically created from Pkl files. The example in this PR generates an OpenAPI v3 schema.
• It is possible to use all sorts of types, including nullable ones.
• There is built-in validation of the configuration parameters via type constraints.

We could also build a utility to generate documentation markdown from the OpenAPI schema. This would improve the quality and consistency of the Collector documentation.

If you believe that this approach has a potential, I would be happy to continue working on it. I would also be happy to collaborate with others who are interested in it :)

Link to tracking issue

Fixes #9769

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This PR was marked stale due to lack of activity. It will be closed in 14 days.

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Closed as inactive. Feel free to reopen if this PR is still being worked on.