refactor(verification): modularize verify_scripts [part 6/7]

[glevco]

Depends on #915

Motivation

This PR is a refactor that removes all code related to script verification from the verify_inputs() method and moves it to a specific verify_scripts() method. This is simply a reorganization, as now we have multiple checks that depend on the final ScriptContext of all tx inputs, so the single method was becoming too complex.

Acceptance Criteria

• Remove TransactionVerifier.verify_script() and implement verify_scripts().
• No behavior should be changed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (645d9b8) 85.44% compared to head (fc82c06) 85.43%.

Additional details and impacted files

@@                   Coverage Diff                    @@
##           feat/sighash/subsets     #916      +/-   ##
========================================================
- Coverage                 85.44%   85.43%   -0.02%     
========================================================
  Files                       289      289              
  Lines                     22636    22637       +1     
  Branches                   3417     3421       +4     
========================================================
- Hits                      19341    19339       -2     
- Misses                     2618     2621       +3     
  Partials                    677      677              

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