feat: create datasource for artifactory registry (#11602)

lib/datasource/api.ts

...atasource/artifactory/__fixtures__/releases-as-files.html

...asource/artifactory/__fixtures__/releases-as-folders.html

lib/datasource/artifactory/__snapshots__/index.spec.ts.snap

lib/datasource/artifactory/common.ts

lib/datasource/artifactory/index.spec.ts

lib/datasource/artifactory/index.ts

lib/datasource/artifactory/readme.md

lib/util/html.spec.ts

lib/util/html.ts