feat: matchCurrentValue (#17953)

docs/usage/configuration-options.md

lib/config/options/index.ts

lib/config/types.ts

lib/config/validation.spec.ts

lib/config/validation.ts

lib/util/package-rules/current-value.spec.ts

lib/util/package-rules/current-value.ts

lib/util/package-rules/index.ts

lib/util/package-rules/matchers.ts