Embed an AJV validator for latest CNA container sub-schema validation prior to submission

[chandanbn]

This allows for a dry run validation to closely match the validation done by CVE services.

1. embed the AJV lib https://ajv.js.org/guide/environments.html#browsers
2. load the CNA container subschema from upstream cve-schema site
3. validate the CNA container object
4. transform AJV errors to JSONEditor errors
5. return the errors.

May be this could be added as a new validator to conf.js, but only run if JSONEditor's inbuilt validators return no errors.

Vulnogram/default/cve5/conf.js

Line 236 in 118009f

validators: [