Remove global nature of parameters and flow decorators

[romain-intel]

This scopes decorators and parameters to the flow itself which should improve compatibility with the runner

[romain-intel]

Duh -- I think I need to import the cli inside the context in the R code. I'll make the change.

[madhur-ob]

cmd.has_flow_params = True is used to determine where to dynamically inject user defined parameters...

they are to be injected in commands like run and sub-commands such as trigger (for argo-workflows, etc.)

It is used in the following snippet in click_api.py:

def extract_command(
    cmd_obj: click.Command, flow_parameters: List[Parameter]
) -> Callable:
    if getattr(cmd_obj, "has_flow_params", False):
        for p in flow_parameters[::-1]:
            cmd_obj.params.insert(0, click.Option(("--" + p.name,), **p.kwargs))

the issue present in #1885 is basically the following:

• there's a parent flow with parameters date and x
• there's a child flow with parameters date_child and x

while the flow_parameters are date_child and x -- this is correct...
the cmd_obj.params already has date and x existing within it at this time -- this needs to be fixed..

[nflx-mf-bot]

Testing[766] @ bcde1b4