This copies x/exp/maps into the standard library (except for the Clear
function which is now available as the clear builtin.)
Fixes #57436
Change-Id: I30dd470c2f7ae34c7c82b4c1025a7582d61fabaa
Reviewed-on: https://go-review.googlesource.com/c/go/+/464343
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Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@google.com>