Migration Risk checklists to new API

[kepae]

per @cesarvarela :

• Convert Atlas checklist schema.json file to a GraphqlObject class and save it to server/types/checklist.ts (gpt is excellent for this)
• Add a checklists field definition to server/fields/cheklists.ts (look at existing types for examples: server/fields/incidents.ts)
• Convert rules.json to graphql-shield permissions and add them to server/fields/checklists.ts
• Add a test fixture for checklists server/tests/fixtures/checklists.ts and add it to server/tests/mutation-fields.spec.ts and server/tests/query-fields.spec.ts
• Migrate custom risks resolver to the checklists field file server/fields/checklists.ts
• Add a Custom test for this resolver server/tests/checklists.ts

To run tests, npm run test:api.

To start a node server with only the API npm run start:api (helpful for debugging)

Note that the Graphql fields checklist and checklists signature changes; instead of receiving a query argument, the argument's name is filter, and the properties differ, so the front end needs to be updated accordingly.