Add compatibility repository for supporting older Bazel versions #1933
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io_bazel_rules_go_compat is a new repository, which contains
compat.bzl, a symbolic link to a file in go/private/compat. There are
multiple versions that compat.bzl may point to (v18.bzl, v22.bzl
initially). These files provide the same definitions with different
implementations.
Initially, this provides abstraction for accessing cc and proto
providers, which are changing in Bazel 0.23.
Fixes #1888