Add sorting and validation on Type tableSchema

[ylyangtw]

This PR

• Added sorting ability to columns (removed after team discussion)
• Added POST type validation on columns

For testing, there are 2 endpoints need to look at:

• GET /semantics/api/types?detail=True
  • Within each tableSchema, columns should be sorted by name in ascending order
  • The following is an expected example

"tableSchema": {
            "columns": [
                {
                    "dc:description": "Probability of complete damage",
                    "datatype": "xsd:double",
                    "name": "complete",
                    "titles": "complete",
                    "qudt:unit": "qudt:CountingUnit",
                    "required": "true"
                },
                {
                    "dc:description": "Expected damage state",
                    "datatype": "xsd:string",
                    "name": "expectval",
                    "titles": "expectval",
                    "qudt:unit": "unit:UNITLESS",
                    "required": "true"
                }
            ]}

• POST /semantics/api/types
  • Please try uploading the following doc, and change the column titles ("dc:description", "datatype", "name", "titles", "qudt:unit", "required"). If any of the column titles is missing, the service is expected to throw an exception.
  • I added this validation because there are some invalid formats in semanticsdb, hence it might be good to add some constraints to avoid posting bad formats to the database.
  • Remember to delete the type after testing if you are testing against dev/prod.

{"@context":
["http://www.w3.org/ns/csvw",
{"@language":"en","gml":"http://www.opengis.net/gml/","iwfs":"http://www.ionicsoft.com/wfs/","xlink":"http://www.w3.org/1999/xlink/","xsd":"http://www.w3.org/2001/XMLSchema/","qudt":"http://qudt.org/2.0/schema/qudt/","unit":"http://qudt.org/vocab/unit/","openvocab":"http://vocab.org/open/"}],
"dc:license":{"@id":"http://opendefinition.org/licenses/cc-by/"},"dc:title":"tests","dc:description":"","url":"tests","openvocab:versionnumber":"1.0",
"tableSchema":{"columns":[{"name":"","titles":"","dc:description":"","datatype":"xsd:integer","required":"true","qudt:unit":""}]}}

[longshuicy]

Tested against dev and works well. This improves the robustness of the semantic service good work!