Make "moonworm generate" consistent with "moonworm generate-brownie"

[zomglings]

moonworm generate-brownie codegen interfaces have many more users (and have seen many more improvements) than the moonworm generate codegen interfaces.

We should modify the code generated by moonworm generate to produce interfaces that are identical to the moonworm generete-brownie-generated code:

1. Transaction parameters
2. --sender and --password handling from CLI
3. CLI and class should be in the same file