Updates default compression and fixes on missing dependencies.

[migueLib]

Add python-build-package.yml action

• This action builds python binaries for linux, macOS and windows across multiple python versions 3.11 to 3.14

Update README.md

• Add banners
• Add sentence specifying minimum python requirements
• Update CLI help (compression default now is 'zlib')

Update pyproject.toml

• Updated minimum Python version requirement from >= 3.9 to >=3.11
• Add psutil and imagecodecs as requirements
• Add PyPI classifiers for OS (Since we now test for them)
• Add PyPI classifiers for specific Python versions supported. This change will be reflected in the banners (see above)

Update environment.yml

• Update the channels, now uses nodefaults. This guarantees the usage of conda-forge over conda.
• Add imagecodecs and psutil as dependencies.

Update backsub/CLI.py

• Changes the default value for --compression to zlib
• Updates help, it now shows what is the default values are on --help

Update python-publish.yml

• Updates actions/checkout and actions/setup-python top v6. This is important for upkeep, the previous versions would be soon deprecated. This change guarantees that the actions don't break soon. (Hopefully)

Update docker-publish.yml in the same way

• Updates actions/checkout top v6 and docker/setup-qemu-action to v3. This is important for upkeep, the previous versions would be soon deprecated. This change guarantees that the actions don't break soon. (Hopefully)
  Lint the yml.

[kbestak]

minor comments should be addressed, I'll update the version after it's merged

[kbestak]

Thanks for the effort Miguel!