refactor(git): Extract types to separate file (#12855)

lib/config/types.ts

lib/manager/bundler/artifacts.spec.ts

lib/manager/cocoapods/artifacts.spec.ts

lib/manager/composer/artifacts.spec.ts

lib/manager/gomod/artifacts.spec.ts

lib/manager/gradle-wrapper/artifacts-real.spec.ts

lib/manager/gradle-wrapper/artifacts.spec.ts

lib/manager/gradle-wrapper/artifacts.ts

lib/manager/jsonnet-bundler/artifacts.spec.ts

lib/manager/pip-compile/artifacts.spec.ts

lib/manager/pipenv/artifacts.spec.ts

lib/manager/types.ts

lib/util/git/author.ts

lib/util/git/config.ts

lib/util/git/index.spec.ts

lib/util/git/index.ts

lib/util/git/types.ts

lib/workers/branch/execute-post-upgrade-commands.ts

lib/workers/branch/get-updated.ts

lib/workers/branch/index.spec.ts