feat: Added pre-commit manager (#7662)

lib/manager/helm-values/util.ts

lib/manager/pre-commit/__fixtures__/.pre-commit-config.yaml

...er/pre-commit/__fixtures__/complex.pre-commit-config.yaml

...re-commit/__fixtures__/empty_repos.pre-commit-config.yaml

...pre-commit/__fixtures__/enterprise.pre-commit-config.yaml

...e-commit/__fixtures__/invalid_repo.pre-commit-config.yaml

...r/pre-commit/__fixtures__/no_repos.pre-commit-config.yaml

lib/manager/pre-commit/__snapshots__/extract.spec.ts.snap

lib/manager/pre-commit/extract.spec.ts

lib/manager/pre-commit/extract.ts

lib/manager/pre-commit/index.ts

lib/manager/pre-commit/parsing.ts

lib/manager/pre-commit/readme.md

lib/manager/pre-commit/types.ts

lib/util/object.spec.ts

lib/util/object.ts