0.12.0

Improvements

• adopt contributor's guidelines [CONTRIBUTING.md] (non-functional change)

Experimental features

• [bundler] generate SBOM components
• [yarn v1] CLI experimental enablement
• [yarn v1] prefetching from offline mirrors
• [rpm] enable TLS client authentication to RPM authenticated repositories with certificates passed via input JSON extra options
• [generic artifact fetcher] CLI experimental enablement
• [generic artifact fetcher] generic YAML lockfile representation