Cut stable 1.0.0 release

[jack-berg]

Issue to track and discuss prerequisites to the first stable 1.0.0 release of opentelemetry-configuration

• Cut 1.0.0-RC release candidate and solicit feedback
• Should file_format follow semantic versioning? #2, addressed in Add a variety of key definitions surrounding stability #142
• Define stability guarantees for stable releases #89, addressed in Add a variety of key definitions surrounding stability #142
• Ensure all experimental properties are marked "experimental" #159
• make it possible to configure named resource detectors #119 (decide if blocking)
• Consider renaming OTLP certificate properties #160

This should mirror the declarative config stability project board, but an issue allows us to have an async discussion about scope, blockers, etc.

[jack-berg]

See also parent issue tracking overall stabilization of declarative config, of which opentelemetry-configuration is just one piece: open-telemetry/opentelemetry-specification#4374