chore: add component compliance checker

[bshaffer]

This allows us to export a list of all our components with the following fields:

• Proto package
• Composer package name
• Github Repo
• PHP namespace
• Component name
• List of compliance errors

For example, to check the compliance of Workflows:

$ dev/google-cloud check-compliance --component Workflows
+------------------------+------------------------+---------------------------------------+------------------------+-----------+-------------------+
| Protobuf package       | Composer package       | GitHub repo                           | PHP namespace          | Component | Validation errors |
+------------------------+------------------------+---------------------------------------+------------------------+-----------+-------------------+
| google.cloud.workflows | google/cloud-workflows | googleapis/google-cloud-php-workflows | Google\Cloud\Workflows | Workflows |                   |
+------------------------+------------------------+---------------------------------------+------------------------+-----------+-------------------+

To export everything to a CSV:

dev/google-cloud check-compliance --csv component-compliance.csv

One of the goals of this tool is to keep track of all the components and their corresponding repositories. Another goal is to provide an automated check for new components, to ensure that everything is in compliance

[bshaffer]

This is being rolled into #5861