Allow wildcards for `--include`

[samwestmoreland]

As far as I can work out, at the moment it's not possible to do something like plz query print //dir/... --include 'metadata*', but it might be nice to be able to do that.

This is potentially too narrow a use case and/or a misuse of labels...

[Tatskaari]

I think this could be very useful. There are targets that have labels like go_package:github.com/thought-machine/please/src/core, and it might be nice to do something like plz query alltargets -i go_package:\*

[peterebden]

Yup, seems useful and I don't think it will be particularly hard to do (we don't index by labels so it isn't a significant performance issue or anything)

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