Support sorting by vector for API Tables

[amorton]

Given this table CQL:

CREATE TABLE IF NOT EXISTS vector_5 (
  key text,
  comment text, 
  comment_vector VECTOR <FLOAT, 5>,
  PRIMARY KEY (key)
);

CREATE CUSTOM INDEX vector_5_comment_vector_idx ON vector_5(comment_vector) 
  USING 'StorageAttachedIndex';

This insert worked:

{
    "insertOne": {
        "document": 
            {
                "key" : "doc 1",
                "comment": "comment about cheese and monkeys",
                "comment_vector": [0.45, 0.09, 0.01, 0.2, 0.11]
            }
    }
}
{
    "status": {
        "primaryKeySchema": {
            "key": {
                "type": "text"
            }
        },
        "insertedIds": [
            [
                "doc 1"
            ]
        ]
    }
}

Can see this in the table:

cassandra@cqlsh:demo> 
cassandra@cqlsh:demo> select * from vector_5;

 key   | comment                          | comment_vector
-------+----------------------------------+-------------------------------
 doc 1 | comment about cheese and monkeys | [0.45, 0.09, 0.01, 0.2, 0.11]

(1 rows)

But when doing ANN sort:

{
    "find": {
        "sort": 
            {
                "comment_vector": [0.45, 0.09, 0.01, 0.2, 0.11]
            }
    }
}

{
    "errors": [
        {
            "message": "Invalid sort clause value: Sort ordering value can only be `1` for ascending or `-1` for descending (not `[0.45,0.09,0.01,0.2,0.11]`)",
            "errorCode": "INVALID_SORT_CLAUSE_VALUE",
            "id": "af946cb8-61a6-4bfa-81ba-be37586b00f7",
            "family": "REQUEST",
            "title": "Invalid sort clause value",
            "scope": "SORT"
        }
    ]
}

insert working as expected, this ticket is to make sort work as expected.

We will then work on $vecotrize separately.

[amorton]

Looking at this