rsc: Track blobs in the database

[V-FEXrt]

POST /blob has been updated so that it now creates a database entry for each blob when it has been uploaded and returns it back to the client.

The ids returned back to the client are mapped using the client provided names.

Example response

HTTP/1.1 200 OK
content-length: 125
content-type: application/json
date: Fri, 15 Dec 2023 21:39:37 GMT

{
    "blobs": [
        {
            "id": 1,
            "name": "foo"
        },
        {
            "id": 2,
            "name": "bar"
        },
        {
            "id": 3,
            "name": "bat"
        },
        {
            "id": 4,
            "name": "bazz"
        }
    ],
    "type": "Ok"
}