go: deprecate the go_rule wrapper

See bazelbuild/bazel-gazelle#676.

A Bazel incompatibility flag (possibly `--incompatible_remap_main_repo`, see bazelbuild/bazel#7130) causes default labels in attributes to be resolved in `@io_bazel_rules_go//go/private` (where `go_rule` is defined) instead of wherever the rule should actually have been defined.

We use `go_rule` as a wrapper around `rule` to add hidden attributes and a toolchain dependency. Instead, we should move hidden attributes to the toolchain *or* provide a set of common attributes. The toolchain dependency can be explicit.

Start by reading the go_rule wrapper in the go/private area and the linked bazel-gazelle#676 and bazel#7130 discussions. Determine whether hidden attributes should move to the toolchain or become common attributes, and make the toolchain dependency explicit. Done means the wrapper is deprecated or removed without the affected default-label incompatibility.

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