chore: vendor in deps

[acpana]

reviewer notes: I'll use this WIP PR as a tracking ticket

• this is mostly a go mod tidy && go mod vendor
• also don't gitignore the vendor directory

TODO:

• solve any issues

[google-oss-prow]

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[justinsb]

I for one was not sad to see vendor gone :-)

[acpana]

I think we are going to punt/ wait on this to see if we actually need to vendor our deps back in.

The good news is that it seems this is not too bad.