feat: add admin login auth flow

[xixas]

Can provide mutation to login user to recieve API token.
Fetch Notifications API is now behind API Guard. So need to use the login token as AUthorization Header

1. Use the graphQL playground to test.

Request Mutation: Add mutation and return data which you want.

mutation {
  login(loginUserInput: {
    username: "admin",
    password: "admin@123"
  }) {
    token
    user
  }
}

Or in postman
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' --data-binary '{"query":"mutation login($input: LoginUserInput!){\n  login(loginUserInput: $input) {\n    token\n    user\n  }\n}\n","variables":{"input":{"username":"admin2","password":"admin@123"}}}' --compressed

Responses

1. Invalid Credentials

{
  "errors": [
    {
      "message": "Invalid username or password",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "login"
      ],
      "extensions": {
        "code": "UNAUTHENTICATED",
        "stacktrace": [
          "UnauthorizedException: Invalid username or password",
          "    at LocalStrategy.validate (/home/vikas/work/projects/osmo-notify/apps/api/src/modules/auth/strategies/local.strategy.ts:19:13)",
          "    at processTicksAndRejections (node:internal/process/task_queues:95:5)",
          "    at LocalStrategy.callback [as _verify] (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/@nestjs/passport/dist/passport/passport.strategy.js:11:44)"
        ],
        "originalError": {
          "message": "Invalid username or password",
          "error": "Unauthorized",
          "statusCode": 401
        }
      }
    }
  ],
  "data": null
}

2. Valid Credentials Request

{
  "data": {
    "login": {
      "token": "osmo-notify-test-key",
      "user": "admin"
    }
  }
}

3. Bad Request

{
  "error": {
    "errors": [
      {
        "message": "Field \"LoginUserInput.password\" of required type \"String!\" was not provided.",
        "locations": [
          {
            "line": 2,
            "column": 25
          }
        ],
        "extensions": {
          "code": "GRAPHQL_VALIDATION_FAILED",
          "stacktrace": [
            "GraphQLError: Field \"LoginUserInput.password\" of required type \"String!\" was not provided.",
            "    at ObjectValue (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/graphql/validation/rules/ValuesOfCorrectTypeRule.js:64:13)",
            "    at Object.enter (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/graphql/language/visitor.js:301:32)",
            "    at Object.enter (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/graphql/utilities/TypeInfo.js:391:27)",
            "    at visit (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/graphql/language/visitor.js:197:21)",
            "    at validate (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/graphql/validation/validate.js:91:24)",
            "    at processGraphQLRequest (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/@apollo/server/src/requestPipeline.ts:246:38)",
            "    at processTicksAndRejections (node:internal/process/task_queues:95:5)",
            "    at internalExecuteOperation (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/@apollo/server/src/ApolloServer.ts:1309:12)",
            "    at runHttpQuery (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/@apollo/server/src/runHttpQuery.ts:232:27)",
            "    at runPotentiallyBatchedHttpQuery (/home/vikas/work/projects/osmo-notify/apps/api/node_modules/@apollo/server/src/httpBatching.ts:85:12)"
          ]
        }
      }
    ]
  }
}