Add SME2 support

[FinnWilkinson]

Now that the Capstone Framework has been updated with the AArch64 auto-sync tool, SimEng should be updated to be compatable with this latest version of Capstone so that SME2 & more SVE2 instructions can be executed through SimEng.

[FinnWilkinson]

With this update, the AArch64 instruction type assignment (i.e. divide, multiply, addition, etc) in Instruction_decode.cc should be updated to try and extract the correct group from the mnemonic rather than this being based off of capstone opcode value

[FinnWilkinson]

SME2 support now in dev branch