Add feature flags for compression algorithms

[famfo]

This pull request adds a feature flag for every compression algorithm. All compression algorithms are all enabled by default, but can be disabled in case they are not used to reduce the amount of dependencies.

Please note: I couldn't run all the tests because some containers are not found in the registry I am using.

[famfo]

What should I do about the failing tests on no-default-features? I could disable the tests which need a specific compression for now.

[dralley]

What should I do about the failing tests on no-default-features? I could disable the tests which need a specific compression for now.

Flag the test on the availability of the compression for now I suppose.

Could you explain your motivation for the PR - is it just reducing dependencies in a use case that doesn't require them? (That's perfectly fine, I'm just curious)

[famfo]

Mostly a use case that doesn't require anything else than zstd and we'd like to reduce the amount of C code we link against.

[dralley]

Do you have more changes planned? If not I can do a new release, otherwise I can wait.

[famfo]

Decompressing content from archives would still be nice but implementing that would probably still take a few days.