This PR adds Doxygen documentation for native wolfSSL API functions that were previously undocumented. It includes documentation notes for APIs gated on specific preprocessor macros:
- WOLF_PRIVATE_KEY_ID: _Id and _Label init helpers (wc_AesInit_Id, wc_AesInit_Label, wc_ecc_init_id, wc_ecc_init_label, wc_InitRsaKey_Id, wc_InitRsaKey_Label) require this for PKCS11 support
- WC_NO_CONSTRUCTORS: New/Delete constructor functions (wc_AesNew/Delete, wc_curve25519_new/delete, wc_ed25519_new/delete, wc_NewRsaKey/DeleteRsaKey) are only available when this is not defined. WC_NO_CONSTRUCTORS is automatically defined when WOLFSSL_NO_MALLOC is defined.
- WOLFSSL_PUBLIC_ASN: ASN functions marked with WOLFSSL_ASN_API include notes indicating they are not public by default
- WOLFSSL_DUAL_ALG_CERTS: wc_GeneratePreTBS and wc_MakeSigWithBitStr for Post-Quantum dual algorithm certificate signing
The New/Delete functions are documented as being exposed to support allocation of structures using dynamic memory to provide better ABI compatibility.
