Support for multiple layer 1

[dr-orlovsky]

This is an example of the scale of changes we need to support Liquid as layer 1. Support for another prospective layer 1 (like Prime) comes at nearly no additional cost.

PR adds support for Liquid as a commitment layer + ability to add more client-side-validation chains in the future

TODO:

• [x] Use chain-specific resolvers in validation
• [x] Validate that seal definitions match list of supported layer 1 from Genesis

[codecov[bot]]

Codecov Report

Merging #183 (c0be2d9) into master (de8f0e6) will decrease coverage by 0.2%. The diff coverage is 5.3%.

@@           Coverage Diff            @@
##           master    #183     +/-   ##
========================================
- Coverage    12.8%   12.5%   -0.2%     
========================================
  Files          30      31      +1     
  Lines        3087    3188    +101     
========================================
+ Hits          394     400      +6     
- Misses       2693    2788     +95     

Flag	Coverage Δ
rust	12.5% <5.3%> (-0.2%)	:arrow_down:

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Files	Coverage Δ
src/contract/operations.rs	24.6% <ø> (ø)
src/lib.rs	15.4% <ø> (ø)
src/stl.rs	100.0% <100.0%> (ø)
src/validation/status.rs	0.0% <ø> (ø)
src/contract/contract.rs	0.3% <0.0%> (-<0.1%)	:arrow_down:
src/contract/assignments.rs	1.0% <0.0%> (-<0.1%)	:arrow_down:
src/contract/mod.rs	12.5% <12.5%> (ø)
src/contract/seal.rs	3.0% <4.2%> (+3.0%)	:arrow_up:
src/validation/anchor.rs	8.0% <8.0%> (ø)
src/validation/validator.rs	0.0% <0.0%> (ø)

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