NSFS | NC | IAM Service - Input Validation

[shirady]

Explain the changes

1. Add input validation before every IAM operation.
2. Rename the file of op get_access_key_last_used (missing prefix iam_).

Issues:

List of GAPs:

1. Move constants to the file iam_constants.js (mainly from iam_utils.js).
2. Special handle for anonymous - currently we block all IAM User API and Access keys API on it (in the future we want to allow IAM User API on it).

Testing Instructions:

Unit Tests

Please run:

1. npx jest test_iam_utils.test.j
2. npx jest test_iam_ops_input_validation.test.js

• [X] Doc added/updated
• [X] Tests added