Elegantly handle Pydantic model schema

[ahopkins]

Closes #152

class Alert(BaseModel):
    hit: dict[str, Any]
    last_updated: datetime


@pydataclass
class AlertResponse:
    alert: Alert
    rule_id: str

This will automatically drop all references and pydantic classes into components:

{
  "openapi": "3.0.3",
  "info": {
    "title": "API",
    "version": "1.0.0",
    "contact": {}
  },
  "paths": {
    "/": {
      "get": {
        "operationId": "get~handler",
        "summary": "Handler",
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "$ref": "#/components/schemas/AlertResponse"
              }
            }
          }
        },
        "responses": {
          "default": {
            "description": "OK"
          }
        }
      }
    }
  },
  "tags": [],
  "servers": [],
  "security": [],
  "components": {
    "schemas": {
      "Alert": {
        "title": "Alert",
        "type": "object",
        "properties": {
          "hit": {
            "title": "Hit",
            "type": "object"
          },
          "last_updated": {
            "title": "Last Updated",
            "type": "string",
            "format": "date-time"
          }
        },
        "required": [
          "hit",
          "last_updated"
        ]
      },
      "AlertResponse": {
        "title": "AlertResponse",
        "type": "object",
        "properties": {
          "alert": {
            "$ref": "#/components/schemas/Alert"
          },
          "rule_id": {
            "title": "Rule Id",
            "type": "string"
          }
        },
        "required": [
          "alert",
          "rule_id"
        ]
      }
    }
  }
}