feat(regex): matchStringsStrategy (#7687)

docs/usage/configuration-options.md

lib/config/common.ts

lib/config/definitions.ts

lib/config/validation.ts

lib/manager/common.ts

lib/manager/regex/__fixtures__/ansible.yml

lib/manager/regex/__fixtures__/example.json

lib/manager/regex/__snapshots__/index.spec.ts.snap

lib/manager/regex/index.spec.ts

lib/manager/regex/index.ts