POC: Bullet stream output style + additional output + error updates

[schneems]

What

This PR is my maximal take on build output which extends to the way that layers emit cache information, and errors are captured and emitted. It is intended to be a fully functioning and working change to update to the bullet_stream style. This work can be used to compare-and-contrast an additional information if the Go owner believes that's the best way forward. It is also intended to be fully functional and mergable (if desired).

Changes

• Implements the https://crates.io/crates/bullet_stream bullet stream using the "strict" (consuming interface) style (versus the easier to use global function style. Either is fine if we want to replace one with the other.
• Update command execution and errors to align with Standardize command execution and display buildpacks-jvm#762
• Pre-emptively implement CacheDiff and TryMigrate on all metadata, this allows standardizing on layer behavior (and output) via https://github.com/heroku/buildpacks-ruby/blob/main/commons/src/layer/diff_migrate.rs.
• Update to latest libcnb
• Ensure all metadata uses deny_unknown_fields
• Add a cache-invalidation "metadata guard" test to every layer that uses the cache
• Switch all file operations to use fs_err so the name of the file is included in the error message

Commits are relatively small and can roughly be reviewed in order if you're interested in merging this. Otherwise you're welcome to use it as a reference or starting place for how to do the work.

Todo:

• Add printing the getting started guide to CI.yml (this allows a reviewer to review the output without having to review the implementation.
• Update to cache_diff crate to a released version after Add custom = <function> container attribute and allow optional ignore = "<reason>" for fields heroku-buildpacks/cache_diff#6 is merged.

Out of scope:

• Error wording and display audit