Add storage-proof command to cli and e2e

[martyall]

Summary

This PR adds a cli command storage-proof to generate proofs that the provider has the whole data. This is meant to work with #2979 where the verify-storage-proof command is added

Changes

• add command storage-proof to cli to generate storage proof backed by core code from Proof of Storage #2971
• added HexString and StorageProof newtypes to unify/simplify reading/outputting binary data with cli commands
• added command as part of e2e script flow

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 50 lines in your changes missing coverage. Please review.

Project coverage is 76.83%. Comparing base (35a9470) to head (e99a6c9).
Report is 53 commits behind head on master.

Files with missing lines	Patch %	Lines
saffron/src/main.rs	0.00%	38 Missing ⚠️
saffron/src/cli.rs	0.00%	11 Missing ⚠️
saffron/src/proof.rs	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2985      +/-   ##
==========================================
- Coverage   76.92%   76.83%   -0.10%     
==========================================
  Files         262      262              
  Lines       61392    61483      +91     
==========================================
+ Hits        47228    47242      +14     
- Misses      14164    14241      +77     

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