Add apidiff target to the Makefile

[sedefsavas]

We should add a Make target that takes a diff on API changes and create a optional pre-submit job that calls that target.

We can follow what CAPI already has:
Adding a Makefile target to build apidiff
Adding a Makefile target to run apidiff locally against origin/main
Adding an optional ProwJob to run apidiff in CI: here

This will improve our confidence on not introducing breaking API changes.

[sedefsavas]

/good-first-issue
/priority backlog
/triage accepted

[k8s-ci-robot]

@sedefsavas:
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/priority backlog
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[meghanajangi]

/assign