chore: Update OpenAPI definition /database/available

[WingCode]

SUMMARY

Update OpenAPI definition for the latest API response for database available. In previous spec, it is list of object expected but from the API response it is dict that is the key "databases" followed by a list of objects. Example:

{
  "databases": [
    {
      "available_drivers": [
        "psycopg2"
      ],
      "default_driver": "psycopg2",
      "engine": "postgresql",
      "name": "PostgreSQL",
      "parameters": {
        "properties": {
          "database": {
            "description": "Database name",
            "type": "string"
          },
          "encryption": {
            "description": "Use an encrypted connection to the database",
            "type": "boolean"
          },
          "host": {
            "description": "Hostname or IP address",
            "type": "string"
          },
          "password": {
            "description": "Password",
            "nullable": true,
            "type": "string"
          },
          "port": {
            "description": "Database port",
            "format": "int32",
            "maximum": 65536,
            "minimum": 0,
            "type": "integer"
          },
          "query": {
            "additionalProperties": {},
            "description": "Additional parameters",
            "type": "object"
          },
          "username": {
            "description": "Username",
            "nullable": true,
            "type": "string"
          }
        },
        "required": [
          "database",
          "host",
          "port",
          "username"
        ],
        "type": "object"
      },
      "preferred": true,
      "sqlalchemy_uri_placeholder": "postgresql://user:password@host:port/dbname[?key=value&key=value...]"
    },
    {
      "available_drivers": [
        "rest"
      ],
      "engine": "presto",
      "name": "Presto",
      "preferred": true
    },
    {
      "available_drivers": [
        "mysqldb"
      ],
      "default_driver": "mysqldb",
      "engine": "mysql",
      "name": "MySQL",
      "parameters": {
        "properties": {
          "database": {
            "description": "Database name",
            "type": "string"
          },
          "encryption": {
            "description": "Use an encrypted connection to the database",
            "type": "boolean"
          },
          "host": {
            "description": "Hostname or IP address",
            "type": "string"
          },
          "password": {
            "description": "Password",
            "nullable": true,
            "type": "string"
          },
          "port": {
            "description": "Database port",
            "format": "int32",
            "maximum": 65536,
            "minimum": 0,
            "type": "integer"
          },
          "query": {
            "additionalProperties": {},
            "description": "Additional parameters",
            "type": "object"
          },
          "username": {
            "description": "Username",
            "nullable": true,
            "type": "string"
          }
        },
        "required": [
          "database",
          "host",
          "port",
          "username"
        ],
        "type": "object"
      },
      "preferred": true,
      "sqlalchemy_uri_placeholder": "mysql://user:password@host:port/dbname[?key=value&key=value...]"
    },
    {
      "available_drivers": [
        "pysqlite"
      ],
      "engine": "sqlite",
      "name": "SQLite",
      "preferred": true
    },
    {
      "available_drivers": [
        "rest"
      ],
      "engine": "druid",
      "name": "Apache Druid",
      "preferred": false
    },
    {
      "available_drivers": [
        "thrift"
      ],
      "engine": "hive",
      "name": "Apache Hive",
      "preferred": false
    },
    {
      "available_drivers": [
        "thrift"
      ],
      "engine": "hive",
      "name": "Apache Spark SQL",
      "preferred": false
    }
  ]
}

TESTING INSTRUCTIONS

Download the OpenAPI spec from http://localhost:8088/api/v1/_openapi
Generate client

java -jar openapi-generator-cli.jar generate -i ./openapi.json -g python -o ./superset_py/ --skip-validate-spec

Test code

import openapi_client
from openapi_client.api.dashboards_api import DashboardsApi
from openapi_client.api.database_api import DatabaseApi

configuration = openapi_client.Configuration(
    host= "http://localhost:8088/api/v1",
    username="admin",
    password="admin")
api_client = openapi_client.ApiClient(configuration)
database_api = DatabaseApi(api_client)
databases = database_api.database_available_get()
print(databases)

[villebro]

LGTM, thanks for fixing!