fix: update operation IDs to string type in GraphQL schema

Change the type of the `id` field from `Int` to `String` in the 
GraphQL schema for `Band`, `DanceHall`, and `Event` types. This 
improves consistency in data representation. Also, modify the 
`codegen` command in `package.json` to simplify the linting 
process for generated files, ensuring cleaner code practices.

codegen.yml

@@ -1,4 +1,4 @@
-schema: ./graphql/schema.graphql
+schema: http://localhost:6080/query
 documents: './graphql/**/*.graphql'
 generates:
   ./graphql/generated/operations.ts: