MINIFICPP-2722 C API enum explicit type

[martinzink]

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[Copilot]

Pull request overview

This PR adds explicit uint32_t underlying types to all enum definitions in the MiNiFi C API header file. The change ensures that all enums have a guaranteed size and representation, which is important for ABI stability and interoperability.

Changes:

• Added explicit uint32_t type specifier to 4 enum definitions: MinifiInputRequirement, MinifiStatus, MinifiValidator, and MinifiLogLevel

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