This change makes the core nogo package less of a "catch all", and splits
functionality into multiple packages. Instead of separate binaries for each
function, a single "cli" package is added with subcommands, and the core
starlark wrappers are also refactored to minimize redundancy.
The new "cli" package also adds support for a "render" command, which
allows factors to be rendered via a Go text template. This is useful for
debugging, but also allows code generation to be updated to use this
mechanism. This eliminates the use of a QEMU wrapper for the older
arch_genrule, and allows the use of a native bazel transition to extract
facts for the appropriate generated file. In other words, the correct facts
will be rendered for generating XXX_arm64.s, even on amd64.
PiperOrigin-RevId: 422846459
0e492a2b5e