Feature #19: a user can now create a new composition with fine-grained limits

[oEscal]

Made changes so a user can create a new composition with fine-grained limits. For instance, a user can do so with the following commands:

$ <composition> <composition.json> --limits '{"concurrency": 30}'
$ <composition> <composition.json> --limits-file limits.json
# where limits.json has, for instance, the contents '{"logs": 5, "concurrency": 30}'

Moreover, I also did some necessary refactoring to the pydeploy code: fixed the raises (it is necessary to create a BaseException object), created the key_value_arg_verification with duplicated code in the below functions, and used black to prettify the overall code.

[rabbah]

thanks for these patches @oEscal - this PR now has a conflict can you resolve?

[oEscal]

thanks for these patches @oEscal - this PR now has a conflict can you resolve?

Done :)