Allow linter to run recursively (across all of aggregate)

[schuylermartin45]

#227 Is likely a pre-requisite to this enhancement.

For the purposes of auditing everything we are responsible for, I think the linter should be able to run across the entirety of aggregate recusively.

When we add new linter rules, we inherently cause new issues to crop-up across the feedstocks. It would be beneficial to detect and anticipate the fallout from adding new rules. It may also lend itself to better automated tooling in the future.

[razzlestorm]

This is possible with the anaconda-expeditor hackdays project. Would love to get that productionized either in the linter repo or somewhere else, and mentioned here.

[razzlestorm]

We shouldn't rebuild a package just for the sake of making sure the linter doesn't throw errors.
Also, this will help find bugs within the linter itself.

[schuylermartin45]

Tracking: https://anaconda.atlassian.net/browse/PAT-179