Add support for Zdinx extension

[anuani21]

This PR includes,

• Updated instruction object with respect to RV32Zdinx instructions.
• Updated rvopcodesdecoder with respect to Zdinx instructions.

[jamesbeyond]

Dear @anuani21

The CTG and ISAC Repo had been moved to riscv-arch-test via PR https://github.com/riscv-non-isa/riscv-arch-test/pull/495

If you think this PR is important, and need to me merged on to risc-v CTG or ISAC, please re-submit your PR against riscv-arch-test

This repository shall be archived in about one week time .