Add new simplify command

[rfbgo]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces a new simplify command for the Ramble framework, designed to identify and optionally remove unused variables, inputs, executables, and compilers from definition files, as well as detect broken references. The review feedback highlights several areas for improvement, including replacing broad exception handling with specific exceptions to improve debugging, optimizing the instantiation of the Keywords class to avoid redundant work, and refactoring duplicated cache-resetting logic in the test suite into a reusable helper function.

[ramble-pr-bot]

Ramble Performance Test Metrics

Results produced with commit: c30d974

Test Name	Outcome	Duration (s)	Most Recent Run (s)	Last 5 Avg (s)
test_analyze_large_file	passed	2.1296	2.1432 (109e8d2)	2.7174
test_large_template_expansion	passed	1.7176	1.4961 (109e8d2)	1.8272
test_many_experiments	passed	30.6107	26.2705 (109e8d2)	31.1637
test_many_objects_defaults	passed	19.3363	15.8682 (109e8d2)	19.2402
test_matrix_filter_perf	passed	1.0376	1.0009 (109e8d2)	1.2124

[codecov]

Codecov Report

❌ Patch coverage is 93.92752% with 62 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.36%. Comparing base (109e8d2) to head (c30d974).

Files with missing lines	Patch %	Lines
lib/ramble/ramble/cmd/simplify.py	93.67%	38 Missing ⚠️
lib/ramble/ramble/test/cmd/simplify.py	94.28%	24 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1661      +/-   ##
===========================================
+ Coverage    93.33%   93.36%   +0.03%     
===========================================
  Files          364      366       +2     
  Lines        35481    36502    +1021     
===========================================
+ Hits         33116    34080     +964     
- Misses        2365     2422      +57     

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