Add NoteField and OrganizationRelationship APIs

[czlee]

This adds support for the noteFields and organizationRelationship APIs:

• https://developers.pipedrive.com/docs/api/v1/NoteFields
• https://developers.pipedrive.com/docs/api/v1/OrganizationRelationships

NoteFields doesn't support create, update or delete. In a weird quirk, it also doesn't single-object GETs, so since find_by_id is grouped with all in Pipedrive::Operations::Read, currently Pipedrive::NoteField.new.find_by_id(id) exists and will try to hit the API, but will come back with

{"status"=>false, "error"=>"Unknown method .", "success"=>false, "not_authorized"=>false, "failed"=>false}

OrganizationRelationships should has a similar quirk for delete_all (not supported), but the other operations should be fine.

Let us know if you have a preferred method for dealing with this!

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