b11074

json: Fixed json enum handling (#28518)

• Fixed json enum handling

Added common_json_value handling for enum values.
Added tests/test-json.cpp to cover testing of some aspects of common_json.

• Removed tests as requested.

• Applied recommended style and simplification

Simplified by delegating enum constructor to the constructor of the underlying type
Matched style of surrounding templating code

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/48980281

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• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
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Android:

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• Windows x64 (CUDA 13) - CUDA 13.4 DLLs
• Windows arm64 (CUDA 13) - CUDA 13.4 DLLs
• Windows x64 (Vulkan)
• Windows x64 (OpenVINO)
• Windows x64 (SYCL)
• Windows x64 (ROCm 10.0)

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• DISABLED
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• UI