Expose language bindings as features from ferveo crate

[piotr-roslaniec]

Based on #114 - Please review it first.

Type of PR:

• Refactor

Required reviews:

• 1

What this does:

• Performs steps necessary for integration with nucypher-core as described in Prepare for integration with nucypher-core #112
• Language bindings are now exposed from ferveo crate as bindings_wasm and bindings_python features, similarly how rust-umbral does it

Issues fixed/closed:

• Closes Domain specific API integration into nucypher-core  #87
• Closes Update crates to Rust 2021 edition #111
• Closes Expose language bindings as features from ferveo crate #110

Why it's needed:

• To use ferveo types directly in nucypher-core

Notes for reviewers:

• This a refactor and reconfiguration of existing crates
• No functional changes

[codecov-commenter]

Codecov Report

Merging #118 (591c05e) into main (d246995) will decrease coverage by 1.95%.
The diff coverage is 34.05%.

@@            Coverage Diff             @@
##             main     #118      +/-   ##
==========================================
- Coverage   79.45%   77.50%   -1.95%     
==========================================
  Files          23       24       +1     
  Lines        4809     4935     +126     
==========================================
+ Hits         3821     3825       +4     
- Misses        988     1110     +122     

Impacted Files	Coverage Δ
ferveo-common/src/lib.rs	100.00% <ø> (ø)
ferveo/src/bindings_wasm.rs	0.00% <0.00%> (ø)
ferveo/src/pvss.rs	91.68% <ø> (ø)
ferveo/src/utils.rs	94.73% <ø> (ø)
ferveo-python/src/lib.rs	1.28% <1.75%> (-62.89%)	⬇️
ferveo/src/bindings_python.rs	59.36% <59.36%> (ø)
ferveo-wasm/src/lib.rs	100.00% <100.00%> (+99.72%)	⬆️
ferveo/src/dkg.rs	95.49% <100.00%> (ø)
ferveo/src/lib.rs	97.40% <100.00%> (ø)
tpke/src/ciphertext.rs	89.41% <100.00%> (-0.06%)	⬇️
... and 1 more