Add zstd support for compression middleware

[RPGillespie6]

What type of PR is this? (check all applicable)

• [ ] Refactor
• [x] Feature
• [ ] Bug Fix
• [x] Optimization
• [ ] Documentation Update
• [x] Go Version Update
• [x] Dependency Update

Description

Modern browsers now natively support zstandard, a superior compression algorithm from a compression ratio and speed standpoint.

See: https://caniuse.com/zstd

This PR:

• Adds zstd support to compress middleware with github.com/klauspost/compress/zstd
• Prefers zstd over gzip or flate when possible to leverage its superior compression ratios and speed
• Updates documentation and adds unit tests

Added/updated tests?

• [x] Yes
• [ ] No, and this is why: please replace this line with details on why tests have not been included
• [ ] I need help with writing tests

Run verifications and test

• [x] make verify is passing
• [x] make test is passing