cmd/api: track deprecations
    
    Deprecating an API creates notices that go out to potentially
    millions of Go developers encouraging them to update their code.
    The choice to deprecate an API is as important as the choice to
    add a new API. We should track those and make them explicit.
    This will also ensure that deprecations go through proposal review.
    
    Change-Id: Ide9f60c32e5a88fb133e0dfedd984b8b0f70f510
    Reviewed-on: https://go-review.googlesource.com/c/go/+/453259
    TryBot-Result: Gopher Robot <gobot@golang.org>
    Run-TryBot: Russ Cox <rsc@golang.org>
    Auto-Submit: Russ Cox <rsc@golang.org>
    Reviewed-by: David Chase <drchase@google.com>