Tests/improve coverage

[hugocaillard]

Description

This PR is an attempt to clean up some dead code and add some unit tests.

• fix some of the remaining clippy warnings (should be the last)
• remove the online clarity repls (clarity-repl/docs) - it has been offline for a few months now and outdated since more, it should be reworked with the clarinet-sdk
• clean some dead code (clarity-utils wasn't imported anywhere)
• add some unit-tests
  • introducing centralized fixture for clarity-repl, hoping to extend it and use it more in the future
• refactor, simplify, and test a great chunk of interpreter.rs

[codecov]

Codecov Report

Attention: 150 lines in your changes are missing coverage. Please review.

Comparison is base (c78709c) 40.15% compared to head (ae8a1a5) 41.96%.

Files	Patch %	Lines
components/clarity-events/src/analysis/mod.rs	0.00%	21 Missing ⚠️
components/clarity-repl/src/repl/interpreter.rs	96.77%	21 Missing ⚠️
...clarity-repl/src/test_fixtures/clarity_contract.rs	67.21%	20 Missing ⚠️
components/clarity-repl/src/repl/debug/dap/mod.rs	0.00%	19 Missing ⚠️
components/stacks-devnet-js/src/lib.rs	0.00%	18 Missing ⚠️
components/clarity-repl/src/repl/session.rs	75.47%	13 Missing ⚠️
components/clarity-repl/src/codec/mod.rs	0.00%	11 Missing ⚠️
components/clarity-repl/src/repl/datastore.rs	9.09%	10 Missing ⚠️
components/clarity-repl/src/repl/debug/mod.rs	0.00%	6 Missing ⚠️
components/clarity-repl/src/bin.rs	0.00%	4 Missing ⚠️
... and 7 more

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1246      +/-   ##
===========================================
+ Coverage    40.15%   41.96%   +1.80%     
===========================================
  Files           86       87       +1     
  Lines        30848    31236     +388     
===========================================
+ Hits         12387    13108     +721     
+ Misses       18461    18128     -333     

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[csgui]

The refactoring and deletion of unused code seems to be ok. Code LGTM.