- Adds SBOMFormats (maps to `sbom-formats` in buildpack.toml) to the BuildpackInfo struct. This makes the information accessible to buildpacks.
- Modifies build such that it only writes the old-style build and launch BOM information if the buildpack API is less than 0.7. If it's 0.7+, it should not write the old style format as that can conflict with the new SBOM format and cause the lifecycle to fail. Omits a warning message if this occurs.
- Adds validation of the new SBOM files that are written by a buildpack. We check that the extension matches up with a valid MIME type that is listed in buildpack.toml's `sbom-formats` field. If it does not match up, then it fails. This should not generally happen with published buildpacks. This check can be helpful while authoring buildpacks, to ensure everything is correctly setup.

Signed-off-by: Daniel Mikusa <dmikusa@vmware.com>
Co-authored-by: Sambhav Kothari <sambhavs.email@gmail.com>
Signed-off-by: Daniel Mikusa <dmikusa@vmware.com>

Signed-off-by: Sambhav Kothari <skothari44@bloomberg.net>