feat: add GraphQL to fetch notifications

[PrinceYadav2]

Description:
This PR adds graphql and to fetch all the notifications

Related changes:
Implement graphql for application root
Add a function to fetch all the notifications
Add Notification Resolver
Register Returning Models by modifying notification entity.

Curl:

curl 'http://localhost:3000/graphql' -H 'Accept-Encoding: gzip, deflate, br' -H 'Content-Type: application/json' -H 'Accept: application/json' -H 'Connection: keep-alive' -H 'DNT: 1' -H 'Origin: http://localhost:3000' -H 'Authorization: Bearer <SERVER_AUTH_TOKEN>' --data-binary '{"query":"query {\n  notifications {\n    channelType\n    createdBy\n    createdOn\n    data\n    deliveryStatus\n    id\n    result\n    status\n    updatedBy\n  }\n}"}' --compressed

Sample Response:

{
  "data": {
    "notifications": [
      {
        "channelType": 2,
        "createdBy": "osmo_notify",
        "createdOn": "2023-11-28T04:59:32.000Z",
        "data": {
          "from": "[email protected]",
          "to": "[email protected]",
          "subject": "Test subject",
          "text": "This is a test notification",
          "html": "<b>This is a test notification</b>"
        },
        "deliveryStatus": 3,
        "id": 1,
        "result": {
          "result": {
            "status": 200,
            "id": "<[email protected]>",
            "message": "Queued. Thank you."
          }
        },
        "status": 1,
        "updatedBy": "osmo_notify"
      },
      {
        "channelType": 1,
        "createdBy": "osmo_notify",
        "createdOn": "2023-11-28T05:04:30.000Z",
        "data": {
          "from": "[email protected]",
          "to": "[email protected]",
          "subject": "Test subject",
          "text": "This is a test notification",
          "html": "<b>This is a test notification</b>"
        },
        "deliveryStatus": 4,
        "id": 2,
        "result": {
          "result": {
            "errno": -3008,
            "code": "EDNS",
            "syscall": "getaddrinfo",
            "hostname": "smtp.gmail.com",
            "command": "CONN"
          }
        },
        "status": 1,
        "updatedBy": "osmo_notify"
      }
    ]
  }
}

Snapshot:
Success:

Fail:

[xixas]

@PrinceYadav2
We have recently also added API key guard.
Add this for graphQL too
https://github.com/OsmosysSoftware/osmo-notify/blob/7778edb226a7fa83e0bf0fa360a4760278fc8bde/src/modules/notifications/notifications.controller.ts#L26

[PrinceYadav2]

@PrinceYadav2 We have recently also added API key guard. Add this for graphQL too

https://github.com/OsmosysSoftware/osmo-notify/blob/7778edb226a7fa83e0bf0fa360a4760278fc8bde/src/modules/notifications/notifications.controller.ts#L26

Added API key guard for the same, attached a screenshot of failing case in description.