[v2] Auto-generate configuration documentation

[yurishkuro]

We want to employ a schema-first approach to configuration:

• define a schema for configuration structures first
• use code generator to create types in Go
• automatically generate documentation from the schema

References:

• Print active configuration (unresolved: Print final configuration OTEL #5223)
• https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/27003
• Config documentation
  • https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/cmd/configschema/docsgen/README.md
  • https://www.otelbin.io/ https://github.com/dash0hq/otelbin/issues/179
  • https://github.com/nimbushq/otel-validator

[mahadzaryab1]

@yurishkuro how should we get started on this?