Add automatic PR labels

[bennettgoble]

Automatically label PRs with a handful of code-area based groups.

[nat-goodspeed]

Please explain in a bit more detail what this accomplishes?

[nat-goodspeed]

Woof, my impulse here is to commit a script that will generate (most of) the labeler.yaml file, possibly appending the lines below from, say, a labeler.yaml.in file. This is a file I will certainly forget to modify if in future I add a new indra subdirectory.

That said, we don't need to block this PR waiting for that.

[Nicky-D]

There is directories missing. At least

• media_plugin/
• win_crash_logger
• linux_crash_logger

maybe some more. Is this intended?

[bennettgoble]

There is directories missing. At least
maybe some more. Is this intended?

Yes, this is a fast first pass. More can be added as appropriate as a follow-up.

[bennettgoble]

Please explain in a bit more detail what this accomplishes?

This change will result in PRs receiving a set of automatic labels based on the files that have been changed. This is useful for sifting through PRs after dozens/hundreds/thousands have been merged.