feat(gradle): add support for gradle repository content descriptors (#33692)

lib/modules/manager/gradle/extract.spec.ts

lib/modules/manager/gradle/extract.ts

lib/modules/manager/gradle/parser.spec.ts

lib/modules/manager/gradle/parser.ts

lib/modules/manager/gradle/parser/common.spec.ts

lib/modules/manager/gradle/parser/handlers.ts

lib/modules/manager/gradle/parser/registry-urls.ts

lib/modules/manager/gradle/types.ts