Publication quality criteria, checks and metrics: semantics_coordinates errors when coordinates is of incorrect type

[duncandewhurst]

For example, in CoST Thailand's point geometries, coordinates is an array of arrays, rather than an array of numbers:

      "geometry" : {
        "type" : "Point",
        "coordinates" : [ [ "5.7712780573108", "101.20494886386501" ] ]
      },

Error:

(psycopg2.errors.InvalidTextRepresentation) invalid input syntax for type numeric: "["17.062692504177054", "99.84443664550781"]"

Related issue on improving validation of coordinates: open-contracting/infrastructure#488