Allows projects to customise the compressor used with toolchains.

This is especially useful with the built toolchains:

```
--extra_toolchains=@rules_zstd//zstd/toolchain/zstd:built
```

Avoids need for C/C++ compilation.

```sh
(12:23:45) ERROR: /root/.cache/bazel/_bazel_root/56129bc94d6ea8f48f3a0d33698e7cb3/external/ape~1.0.0-beta.12/ape/assimilate/BUILD.bazel:5:19: assimilating external/ape~1.0.0-beta.12~_repo_rules~cosmos-assimilate/assimilate [for tool] failed: (Exit 1): ape failed: error executing ApeAssimilate command (from target @@ape~1.0.0-beta.12//ape/assimilate:tar)
  (cd /root/.cache/bazel/_bazel_root/56129bc94d6ea8f48f3a0d33698e7cb3/execroot/_main && \
  exec env - \
  external/ape~1.0.0-beta.12~_repo_rules~ape-arm64.elf/ape external/ape~1.0.0-beta.12~_repo_rules~cosmos-assimilate/assimilate -e -a -o bazel-out/aarch64-opt-exec-ST-13d3ddad9198/bin/external/ape~1.0.0-beta.12/ape/assimilate/tar.ape/tar external/ape~1.0.0-beta.12~_repo_rules~cosmos-tar/tar)
{"msg":"exec container process `/buildbuddy/remotebuilds/b383a216-29ef-4917-b860-092ccaae15fa/external/ape~1.0.0-beta.12~_repo_rules~ape-arm64.elf/ape`: Exec format error","level":"error","time":"2024-08-30T12:23:44.665869Z"}
```

Assume the remote executor is `amd64` and `@ape` is assimilating for `arm64`.

Not sure why this is occuring and needs debugging.

`@ape//:tar` is deprecated.

Needed to switch to piping the data into `tar`. The `PATH` override
does not work on Windows. This has the added benefit that we do not
depend on any `tar` specific flags.

This brings remote execution support for the binaries.

It also updates the chain to use a newer version of `toolchain_utils` that
provides `toolchain.run` that can be passed to `ctx.actions.run#executable` to
enable passing the runfiles into the action.

For consistency with other rulesets we create.

This detects that multiple files are unpacked and identical.

The `fixture.tar` now has multiple files contained which enables
easier testing of other rules.