TGeoFinder should have a method to reset the in memory sqlite database

Hi @Belval

1. I find out that every time when you create the [TGeoFinder](https://github.com/aws-samples/amazon-textract-textractor/blob/master/tpipelinegeofinder/textractgeofinder/tgeofinder.py#L51) class from the JSON data, you actually generate a uuid for this object and insert lot of data into the sqlite lite database. I suggest adding a optional parameter when you create TGeoFinder object, allow user to explicitly pass unique identifier as a key, so user can explicitly delete all records related to this object in database in case the original object is already garbage collected.
2. consider adding an explicit method instead of doing ``del t_geo_finder`` object for more Pythonic API.

Wonderful library!