*: replace ossfuzz with go native fuzz invocationsraggi/gofuzz

The fuzzing actions are the longest actions in our CI right now. This
would be a good and happy thing if the bulk of the time was spent
fuzzing, but sadly the bulk of the time is spent doing build
preparations due to the nature of the ossfuzz docker setup.

Only two out of our 5 packages that contain fuzzers were ossfuzz
fuzzers, the rest are Go 1.18+ fuzzers. These two are converted to go
fuzzers, and then the github workflow is updated to just go test fuzz.

The action setup contains two separate steps for actions-cache, one that
handles the fuzzing corpus specifically so that we shuttle forward any
interesting corpus over time.

If the action fails, it will upload all the testdata/* directories,
which will include the data necessary to commit interesting cases for
permanent redistribution.

Signed-off-by: James Tucker <james@tailscale.com>

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