Handle updates in verifier CLI arguments and subcommands

[asraa]

After slsa-framework/slsa-verifier#231

we will have two sub-commands added to the verifier: verify-artifact and verify-container.

Then, we will also have the following transformation on argument names:

# provenance -> provenance-path
# source -> source-uri
# tag -> source-tag
# versioned-tag -> source-versioned-tag
# branch -> source-branch
# workflow-input -> build-workflow-input

WDYT about making a e2e_verifier_arg_transformer $tag that returns a function who's signature is func $argument and returns the correct argument name? Likewise, we can make e2e_verifier_subcommand_transformer $tag that returns a func whos signature is func $artifact-type and returns either verify-artifact or "" for previous versions?

I am not so well-versed in bash scripting, but I think I can do something like that.