feat: add --compression none for decompression support (#66)

[DhanashreePetare]

Pull Request

Description

Adds --compression none as a valid value for the --compression flag, enabling users to decompress downloaded files without recompressing them to another format.
Previously, --compression only supported bz2, gz, and xz — meaning users could convert between compression formats or compress uncompressed files, but had no way to simply decompress a file and save it as-is. With this change, --compression none decompresses the file and saves it without any compression extension.

# Download a bz2 file and save it uncompressed
databusclient download https://databus.dbpedia.org/dbpedia/mappings/mappingbased-literals/2022.12.01/mappingbased-literals_lang=az.ttl.bz2 --compression none
# Result: mappingbased-literals_lang=az.ttl (no compression)

If the file is already uncompressed, --compression none is a no-op.

Related Issues
closes#66

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• Housekeeping

Checklist:

• My code follows the ruff code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
  • poetry run pytest - all tests passed
  • poetry run ruff check - no linting errors

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