feat: #49 Add new redeemer purpose, gov action changes

[satran004]

49

1. New script purpose
2. New protocol parameters
3. New Gov Action changes
4. Auxiliary Data deserialization logic doesn't rely on CCL
5. New RedeemerTag, ExUnit class instead of CCL's RedeemerTag, ExUnit. This is to avoid model level dependency with CCL. There are some dependencies still there, we will plan to remove wherever it makes sense.