Qiskit / Qiskit.jl / 28632048266

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Add friendly `Base.show` methods for wrapped C objects (#40)

* fix: Add friendly Base.show methods for wrapped C objects

- Override Base.show for QuantumCircuit to display num_qubits, num_clbits, and num_instructions
- Override Base.show for SparseObservable to display num_qubits and num_terms
- Override Base.show for TargetEntry to display num_properties
- Override Base.show for Target to display num_qubits and num_instructions
- Override Base.show for TranspileLayout for a friendly display
- Override Base.show for TranspileResult to display circuit and layout

These changes provide user-friendly output instead of showing raw pointer
representations when working with wrapped C objects in the REPL.

Fixes #35

* test: Add comprehensive tests for Base.show methods

- Add tests for QuantumCircuit.show with different configurations
- Add tests for SparseObservable.show with various qubit counts
- Add tests for Target.show and TargetEntry.show methods
- Add tests for TranspileLayout.show and TranspileResult.show
- Verify output contains expected class names and property information

These tests increase coverage for the new friendly show methods added in #35.

* fix: Correct C function wrappers and improve transpiler test

- Fix qk_target_num_qubits and qk_target_num_instructions wrappers to properly call C functions
- Fix qk_target_entry_num_properties wrapper to use C function correctly
- Fix qk_target_entry_add_property wrapper to handle Ref conversion
- Fix qk_target_add_instruction to properly convert pointers to Ref
- Update transpiler show test to use a fully configured target
- Import C functions with aliases to avoid naming conflicts

* fix: Correct wrapper implementations and simplify tests

- Fix qk_target_num_qubits/instructions to call ccall directly with Ptr
- Fix qk_target_entry_num_properties to call ccall directly with Ptr
- Fix qk_target_entry_add_property to handle Ptr correctly without Ref
- Fix qk_target_add_instruction to use ccall... (continued)

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