Support only Zstd Compression

[ata-nas]

Persona

As a Block Node Developer/Operator

Request

I want to for now only support zstd compression type

Goal

So that the code is simpler and easier to manage

Technical Notes

• we currently envision that we will only need to use zstd compression
• we should simplify the current reading, writing and path resolution logic
• we should only support zstd compression for now, adding additional compression types only if needed in the future
• the strategy should be to check for a magic number to determine the type of compression and attempting to decompress and read based on the magic number result, falling back to uncompressed if failed. (we could start only with zstd directly in the beginning?)
• what needs to be done:
  • drop the support for compression types other than zstd for now
  • remove block extensions for compression, blocks should just end with .blk, checking for magic number is far more reliable
  • the wrapper classes for live, archive and unverified paths will become redundant, should be simplified to a resolved Path