Add all_systems() function

[luke-kiernan]

Summary

• Adds exported all_systems() function that builds every system in the catalog and returns a Dict{Tuple{DataType, String}, PSY.System}
• Systems that fail to build (e.g., those requiring specific kwargs like avr_type) are skipped with a warning
• Adds test for the new function

Closes #178

Test plan

• test_all_systems passes: verifies return type, length, and contents using a single-system catalog

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Adds a new public helper to build every PowerSystems.System described by a SystemCatalog, returning a dictionary keyed by (category, system_name) for bulk inspection / querying workflows (Issue #178).

Changes:

• Introduces exported all_systems(; system_catalog=..., kwargs...) to iterate the catalog and build systems, skipping failures with a warning.
• Exports all_systems from the package module.
• Adds a focused test covering the basic return type/shape using a single-system catalog.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/system_catalog.jl	Adds all_systems implementation + docstring, iterating categories/systems and warning on build failures.
src/PowerSystemCaseBuilder.jl	Exports the newly added all_systems API.
test/test_all_systems.jl	Adds test_all_systems to validate return type and contents for a minimal catalog.

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[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.64%. Comparing base (abd3f09) to head (471d50b).

Files with missing lines	Patch %	Lines
src/system_catalog.jl	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #185      +/-   ##
==========================================
- Coverage   92.67%   92.64%   -0.03%     
==========================================
  Files          18       18              
  Lines        4475     4485      +10     
==========================================
+ Hits         4147     4155       +8     
- Misses        328      330       +2     

Flag	Coverage Δ
unittests	92.64% <81.81%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/system_catalog.jl	87.75% <81.81%> (-1.72%)	⬇️

... and 1 file with indirect coverage changes

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