RCP-240313A: support future SPV proofs by refactoring anchors

[dr-orlovsky]

All non-consensus data has been removed from anchors and consignment API into resolver API, which can now return SPV info etc without consensus-breaking changes

Matches BP-WG/bp-core#84

[codecov]

Codecov Report

Attention: Patch coverage is 5.71429% with 33 lines in your changes are missing coverage. Please review.

Project coverage is 14.1%. Comparing base (e04cfff) to head (2639236).

Files	Patch %	Lines
src/validation/validator.rs	0.0%	22 Missing ⚠️
src/validation/consignment.rs	0.0%	7 Missing ⚠️
src/bin/rgbcore-stl.rs	0.0%	4 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #228   +/-   ##
======================================
  Coverage    14.1%   14.1%           
======================================
  Files          33      33           
  Lines        4154    4142   -12     
======================================
  Hits          585     585           
+ Misses       3569    3557   -12     

Flag	Coverage Δ
rust	14.1% <5.7%> (+<0.1%)	⬆️

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