Pip package release

[feltroidprime]

resolves #140 +

• adds devnet declare - deploy - invoke tests in CI
• remove cairo-lang dependency and cairo zero code, moved to https://github.com/feltroidprime/garaga-zero , dependent on the garaga pip package for the hints
• remove kkt endpoint contract as the work will be done in kkrt repo directly
• uses only pyproject.toml for dependencies (splitted in normal and dev dependencies), no more requirements.txt
• uses uv at setup instead of pip which resolves and installs much quicker
• update to cairo 2.7.1. The ECIP class hash has changed due to it.
• changes bn_bits encoding in the miller loop to save one iteration