refactor(managers): implement custom managers api (#23357)

lib/config/index.ts

lib/config/options/index.ts

lib/config/validation-helpers/managers.spec.ts

lib/config/validation-helpers/managers.ts

lib/config/validation.spec.ts

lib/config/validation.ts

lib/modules/manager/api.ts

lib/modules/manager/custom/api.ts

lib/modules/manager/custom/index.spec.ts

lib/modules/manager/custom/index.ts

lib/modules/manager/custom/regex/index.spec.ts

lib/modules/manager/custom/regex/index.ts

lib/modules/manager/fingerprint.spec.ts

lib/modules/manager/index.spec.ts

lib/modules/manager/index.ts

lib/modules/manager/metadata.spec.ts

lib/util/package-rules/managers.spec.ts

...ers/repository/extract/extract-fingerprint-config.spec.ts

lib/workers/repository/extract/extract-fingerprint-config.ts

lib/workers/repository/extract/index.spec.ts