SubscriptionDataSource Ctor Overload for Headers as PyObject/Dict

[AlexCatarino]

Expected Behavior

We can use Python dict to pass values to the headers argument:

headers = {"Authorization": "Basic (HelloWorldPython"}
        return SubscriptionDataSource(
            "https://eoko1uke6k6itbv.m.pipedream.net", 
            SubscriptionTransportMedium.REMOTE_FILE,
            FileFormat.CSV,
            headers
        )

Actual Behavior

Not supported.

Potential Solution

Add PyObject overload. See download method.

Checklist

• I have completely filled out this template
• I have confirmed that this issue exists on the current master branch
• I have confirmed that this is not a duplicate issue by searching issues

[aiSynergy37]

Opened fix PR: #9363