perf(verification): add multithreading to tx scripts verification

[glevco]

Motivation

Improve transaction verification speed by parallelizing script verification with Python multithreading (see #1128).

Acceptance Criteria

• Change script_eval to evaluate_scripts, which now executes multiple input scripts in parallel using Python multithreading.
• Update transaction verifier accordingly.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[github-actions]

Bencher Report

Branch	perf/scripts-verification
Testbed	ubuntu-22.04

Click to view all benchmark results

Benchmark	Latency	Benchmark Result nanoseconds (ns) (Result Δ%)	Lower Boundary nanoseconds (ns) (Limit %)	Upper Boundary nanoseconds (ns) (Limit %)
sync-v2 (up to 20000 blocks)	📈 view plot 🚷 view threshold	101,445,393,095.18 (-0.60%)	91,851,043,656.34 (90.54%)	112,262,386,691.08 (90.36%)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.43%. Comparing base (9fddd7a) to head (b1ad670).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1130   +/-   ##
=======================================
  Coverage   84.42%   84.43%           
=======================================
  Files         317      317           
  Lines       24291    24300    +9     
  Branches     3696     3699    +3     
=======================================
+ Hits        20507    20517   +10     
+ Misses       3068     3067    -1     
  Partials      716      716           

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