NSFS | NC | Use avj compile and Reuse validate Function

[shirady]

Explain the changes

1. In NSFS schemas separate the compile (which is done once) from the validate (which is reuse).

Issues:

1. Currently we use ajv.validate(schema_name, object_to_validate) and it doesn’t align with the avj documentation (here), please notice the comment “Best performance: compile and getSchema methods”:

Best performance: compile and getSchema methods
The best performance is achieved when using compiled functions returned by compile or getSchema methods.
While execution of the compiled validation function is very fast, its compilation is relatively slow, so you need to make sure that you compile schemas only once and re-use compiled validation functions

Note: it is a partial fix to #7874

Testing Instructions:

1. Run the schema unit tests:
   npx jest test_nc_nsfs_account_schema_validation.test.js
npx jest test_nc_nsfs_bucket_schema_validation.test.js
npx jest test_nc_nsfs_config_schema_validation.test.js

• Doc added/updated
• Tests added

[naveenpaul1]

LGTM