feat: new geo spatial functions

[lvca]

Issue #796

New functions to create shapes:

• point(<x>,<y>). Example: select point(10,10,20,20) as point
• circle(<center-x>,<center-y>,<distance>). Example: select circle(10,10,10) as circle
• rectangle(<top-x>,<top-y>,<bottom-x>,<bottom-y>). Example: select rectangle(10,10,20,20) as rectangle
• lineString([ <point>* ]). Example: linestring( [ [10,10], [20,10], [20,20], [10,20], [10,10] ] )
• polygon([ <point>* ]). Example: select polygon( [ point(10,10), point(20,10), point(20,20), point(10,20), point(10,10) ] ) as polygon and select polygon( [ [10,10], [20,10], [20,20], [10,20], [10,10] ] ) as polygon

New methods that work with shapes:

• isWithin(). Example: select point(11,11).isWithin( circle(10,10,10) ) as isWithin
• intersectsWith(). Example: select linestring( [ [10,10], [20,10], [20,20], [10,20], [10,10] ] ).intersectsWith( rectangle(10,10,20,20) ) as intersectsWith