Clarify parsers structure

[JoanFM]

Parser structure polutes our CLI interface and help usage. I suggest we avoid having all the mixins in parsers and just have a parser for each object and these parsers take them from a collection of objects parameters dictionaries:

parser.add_argument(
    '--return-responses',
    action='store_true',
    default=False,
    help="If set, return results as List of Requests instead of a reduced DocArray.",
)

For instance, we could have a dictionary liike this:

# in some args_collection
return_responses_argument = {name_or_flags: '--return-responses', action: 'store_true', default: False, help='If set, return results as List of Requests instead of a reduced DocArray."'

# in each parser object:
from args_collectgion import return_responses_argument

parser.add_argument(**return_responses_argument)

[JoanFM]

Objects to clarify:

• set_flow_parser
• set_client_parser
• set_gateway_parser
• set_deployment_parser
• set_pod_parser

[jina-bot]

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