Support configuring the compression level when archiving bundles

[jarnfast]

What does this change

This adds an extra command line flag for the archive command that allows configuring the level of compression to use when creating the gzipped tar archive.

$ porter archive whalegap.tgz --reference ghcr.io/getporter/examples/whalegap:v0.2.0 --compression NoCompression

If the flag is omitted the gzipped tar archive will be compressed with DefaultCompression - this is equivalent to the pre-configurable-compression behavior of Porter.

Possible values for the --compression flag is listed in the help text.

$ porter archive -h
[snipped]
Flags:
  -c, --compression string   Compression level to use when creating the gzipped tar archive. Allowed values are: BestCompression, BestSpeed, DefaultCompression, HuffmanOnly, NoCompression (default "DefaultCompression")

publish appears to not care about the compression level of the gzipped tar archive.

What issue does it fix

Closes #3083

Notes for the reviewer

I opted to expose all compression levels for the gzip/flate go module - keeping the case intact. We can elect to exclude some and/or adjust the casing.

Checklist

• [x] Did you write tests?
• [x] Did you write documentation?
• [ ] Did you change porter.yaml or a storage document record? Update the corresponding schema file.
• [ ] If this is your first pull request, please add your name to the bottom of our Contributors list.