[@kadena/pactjs-cli] allow the user to retrieve and generate in one command

[alber70g]

Is your feature request related to a problem? Please describe.
Currently the commands are split up between retrieval of the contract and generation of the typings

Describe the solution you'd like
I like to have one command for retrieval and generation

Describe alternatives you've considered
Running both after one another but this requires the storing of a file.

Additional context
Related to this is the namespace that's not included in the retrieved contract. So the namespace is lost in type generation. See also #127

[alber70g]

• create contract-generate --contract option, that calls the functions used for retrieve-contract and contract-generate

[0] Namespace can be derived from the passed argument and the information in the contract about the module. In this case the module in the contract is "KAO" so the namespace is the difference between free.KAO and KAO.