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* std.crypto: add AES-CCM and CBC-MAC Add AES-CCM (Counter with CBC-MAC) authenticated encryption and CBC-MAC message authentication code implementations to the standard library. AES-CCM combines CTR mode encryption with CBC-MAC authentication as specified in NIST SP 800-38C and RFC 3610. It provides authenticated encryption with support for additional authenticated data (AAD). CBC-MAC is a simple MAC construction used internally by CCM, specified in FIPS 113 and ISO/IEC 9797-1. Includes comprehensive test vectors from RFC 3610 and NIST SP 800-38C. * std.crypto: add CCM* (encryption-only) support to AES-CCM Implements CCM* mode per IEEE 802.15.4 specification, extending AES-CCM to support encryption-only mode when tag_len=0. This is required by protocols like ZigBee, Thread, and WirelessHART. Changes: - Allow tag_len=0 for encryption-only mode (no authentication) - Skip CBC-MAC computation when tag_len=0 in encrypt/decrypt - Correctly encode M'=0 in B0 block for CCM* mode - Add Aes128Ccm0 and Aes256Ccm0 convenience instances - Add IEEE 802.15.4 test vectors and CCM* tests * std.crypto: add doc comments for AES-CCM variants