✨Source Mailchimp: Add Segments stream

[ChristoGrab]

What

Add the Segments stream to Source Mailchimp
Mailchimp Docs link

How

• Each stream slice consists of a parent list
• Date filter is passed as a request_param using the value of state for the current parent list. If none exists, no filter is used and all records are read.
• Each list has its own state value, ie

{ 
  list_id_1: {"last_updated": <timestamp>}, 
  list_id_2: {"last_updated": <timestamp>}
}

User Impact

Not a breaking change.

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[artem1205]

you could use ids parameter to increase readability of parametrized tests (see example here)