API sanation for state types

[dr-orlovsky]

• Add blinding to data types
• Make function names and signatures working with blinding factors more consistent
• Separate state which contains blinding information from the state which doesn't
• Provide a trait for non-blinded state (KnownState)

Prerequisite for RGB-WG/rgb-std#126 and RGB-WG/rgb#92

[codecov]

Codecov Report

Attention: 73 lines in your changes are missing coverage. Please review.

Comparison is base (c627404) 16.9% compared to head (2b59903) 16.7%.

Files	Patch %	Lines
src/contract/data.rs	9.1%	30 Missing ⚠️
src/contract/contract.rs	4.2%	23 Missing ⚠️
src/contract/attachment.rs	0.0%	13 Missing ⚠️
src/vm/op_contract.rs	0.0%	5 Missing ⚠️
src/validation/logic.rs	0.0%	1 Missing ⚠️
src/validation/state.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #200     +/-   ##
========================================
- Coverage    16.9%   16.7%   -0.2%     
========================================
  Files          32      32             
  Lines        3827    3874     +47     
========================================
- Hits          647     646      -1     
- Misses       3180    3228     +48     

Flag	Coverage Δ
rust	16.7% <12.0%> (-0.2%)	⬇️

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