Add support for Apache asf.yaml files

These are ABOUT file-like datafiles with some essential project info that are stored in the Git repos. The main repo is https://github.com/apache/infrastructure-asfyaml
See also https://infra.apache.org/asf-yaml.html

A work by @Humbedooh @clambertus ... @raboof are you aware of these? ... they could have security use may be?

See for instance: https://github.com/apache/maven-dependency-plugin/blob/master/.asf.yaml
```YAML
#
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# see https://s.apache.org/asfyaml
github:
description: "Apache Maven Dependency Plugin"
homepage: https://maven.apache.org/plugins/maven-dependency-plugin/
labels:
- java
- build-management
- maven-plugins
- maven-dependency-plugin
- maven
enabled_merge_buttons:
squash: true
merge: false
rebase: true
autolink_jira:
- MDEP
notifications:
commits: commits@maven.apache.org
issues: issues@maven.apache.org
pullrequests: issues@maven.apache.org
jira_options: link label comment
```

and https://github.com/search?q=org%3Aapache path%3A.asf.yaml&type=code