collect signatures from the stash

[cymqqqq]

Description:

1. Add sigs_for in the stash reader provider
2. Collect genesis, scheme, iface, and iimpl signatures from the stash provider

Questions: I don't understand the following TODO

1. Conceal everything we do not need. (conceal seal, transition, and state?)
2. Add known sigs to the consignment. (What's the difference from the collect signatures from the stash?)

And the know sigs, do you mean the content signatures from the stash or the signatures from the disclosure? (In the Disclosure, there is PublicKey, Signature Key-Value map).

[codecov]

Codecov Report

Attention: Patch coverage is 42.50000% with 23 lines in your changes missing coverage. Please review.

Project coverage is 20.5%. Comparing base (7f637c6) to head (5a0d3f4).
Report is 5 commits behind head on master.

Files	Patch %	Lines
src/persistence/stock.rs	28.1%	23 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #232     +/-   ##
========================================
+ Coverage    17.6%   20.5%   +3.0%     
========================================
  Files          37      37             
  Lines        7535    7666    +131     
========================================
+ Hits         1323    1574    +251     
+ Misses       6212    6092    -120     

Flag	Coverage Δ
rust	20.5% <42.5%> (+3.0%)	⬆️

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[dr-orlovsky]

ACK 5a0d3f4