supports adding DltResource in RESTAPIConfig dict

[willi-mueller]

Description

Related Issues

• Resolves rest_api: accept DltResource instances in resource list #1837

TODO before merging

• write documentation
• discuss: some kind of error message in case people implement a resource returning Generator[dict[str, Any]] instead of `Generator[list[dict[str, Any]]]? Or is documentation enough?

Crashes: process_parent_data_item because item is a str instead of Dict[str, Any]:

 def repositories():
        """A seed list of repositories to fetch"""
        yield from [{"name": "dlt"}, {"name": "verified-sources"}, {"name": "dlthub-education"}]

Correct:

 def repositories():
        """A seed list of repositories to fetch"""
        yield [{"name": "dlt"}, {"name": "verified-sources"}, {"name": "dlthub-education"}]

Also correct:

def repositories():
    """A seed list of repositories to fetch"""
    yield [
        [{"name": "dlt"}],
        [{"name": "verified-sources"}],
        [{"name": "dlthub-education"}],
    ]

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[burnash]

Awesome work, @willi-mueller, thank you!