encoding/decoding for saffron data

[martyall]

Scaffolding for saffron cli

• Set up the crate
• Enable CLI
• Add functions to encode/decode data from bytes to field elements
• Add tests (property based tests and shell script to test cli)

[codecov]

Codecov Report

Attention: Patch coverage is 64.95726% with 41 lines in your changes missing coverage. Please review.

Project coverage is 76.51%. Comparing base (3ebeaf4) to head (0ea239e).
Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
saffron/src/main.rs	0.00%	27 Missing ⚠️
saffron/src/cli.rs	0.00%	7 Missing ⚠️
saffron/src/serialization.rs	91.56%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2955      +/-   ##
==========================================
- Coverage   76.61%   76.51%   -0.11%     
==========================================
  Files         255      258       +3     
  Lines       61014    61188     +174     
==========================================
+ Hits        46747    46818      +71     
- Misses      14267    14370     +103     

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