add geospatial type support

[Jaysok]

Description

This will add geospatial type support. Thus resolves #341

External Dependency

Added external dependency from @types/geojson which already defined geojson types pretty good, conforming rfc7946 - GeoJSON Format.

Tests

I focused mainly on making a geospatial query easily and make simple GeoJSON queries work with newly added types.
Test data is mostly from MongoDB official documents and I picked some from there.
GeoJSON query objects in the actual queries are picked from the data or made by myself.

• searching-for-restaurants
• Place
• Neighborhoods
• IPosition - made by myself

Possible issues in the future

• Aggregation operator $geoNear is not considered.
• MongoDB versioning is not strictly considered.

[lucsoft]

Could you rebase aka fix the merge conflicts from master

[Jaysok]

Could you rebase aka fix the merge conflicts from master

OK, I've just done it

[erfanium]

@Jaysok Great, thank you!

[Jaysok]

@Jaysok Great, thank you!

Thank you either! @erfanium