Parsing invalid geo match predicate should not generate exception

The return type of MatchExpressionParser::parse() is StatusWith<std::unique_ptr<MatchExpression>>, but a UserException is thrown from this method when given an invalid geo near predicate (see GeoNearExpression::parseLegacyQuery(), GeoNearExpression::parseNewQuery(), and GeoNearExpression::parseFrom()).

Instead, an error Status should be returned.