Modify mesoscope metadata mapper for deepdive data

The V1 deepdive data will be presented at the swdb. It needs valid metadata including a session.json. Generate a sessions json using a mapper similar to the mesoscope. A representative dataset can be found here:

\\allen\programs\braintv\production\neuralcoding\prod25\specimen_703219414\ophys_session_757865337\
http://lims2/projects/704764261?association=project&ophys_session_id=758708920&parent_scaffold=ophys_sessions&utf8=%E2%9C%93

name
V1 Deep Dive