Release stable ferveo crates

[piotr-roslaniec]

Functional changes

• Update CI & CD for Python bindings to account for different Python versions and targets #117
• Create and expose FerveoVariant enum from bindings #116
• Prepare for integration with nucypher-core #112
• Expose language bindings as features from ferveo crate #110
• Remove the remainder of statfulness from the DKG instances #108
• Handle pessimistic cases in the light tDec variant #36
• Domain specific API integration into nucypher-core  #87

Documentation

• Document Verifiable DKG protocol #69
• Document crates #121

Packaging & CI

• Update crates to Rust 2021 edition #111
• Release 0.1.0 of ferveo  #120
• Update CI & CD for Python bindings to account for different Python versions and targets #117
• Rename crates to nucypher_*, adhere to snake_case naming convention