https://docs.buf.build/
Buf is the successor to https://github.com/uber/prototool which we
already use for linting.
This dramatically simplifies our Makefiles, which are both extremely
complicated and have led to numerous bugs historically, such as
https://github.com/istio/api/issues/1678.
This will make changes to the generation much simpler as well. For
example, to migrate to gogo protobuf, we will just need to change `gogo`
-> `go` in one location, rather than trying to wrangle 500 lines of
Makefiles. Additionally, its quite a bit faster - the whole proto stuff
is done in <1s now.
John Howard