Compression algorithm changes

[adam-fowler]

Algorithm is created with configuration (as associated value)
Add new configuration values (compressionLevel, memoryLevel and strategy)
For example

let algorithm = CompressionAlgorithm.gzip(
    configuration: .init(
        windowSize: 15,
        compressionLevel: 9,
        memoryLevel: 9,
        strategy: .huffmanOnly
    )
)

Everything has default values so this can be shortened to

let algorithm = CompressionAlgorithm.gzip()

Also renamed algorithms to gzip, zlib and deflate instead of gzip, deflate and rawDeflate. This mean deflate means something different from what it did.

[jhoughjr]

Looks perfect to me.

[jhoughjr]

Do you need anything from me to get this merged? I've got to refactor my alg init anyway so these changes come at the right time.