Reference implementation for IExternalKycList, and guidance on internalKycActivated

While working on an external KYC provider against ATS v8, wanted to know 2 things that the docs didnt quiet clear

**First:** would a reference implementation of `IExternalKycList` be wanted ? Only one in the tree is at `MockedExternalKycList` but i saw the web app already propagates `AddExternalKYC` views. I do have its working implementation and glad to share a documented version/docs..

**Second:** will issuing with the config `internalActivatedKyc` be supported?
`KycStorageWrapper.VerifyKycStatus` collapses to `isExternallyGranted` with no flags, this makes the external
provider the KYC authority! and `grantKyc` isnt called. Do the sdk n web app handle some token with an empty internal register? otherwise it means they assume `getKycAccountsData` returns rows

Start by reading MockedExternalKycList and tracing the AddExternalKYC views, then inspect KycStorageWrapper.VerifyKycStatus, grantKyc, and getKycAccountsData. Clarify whether internalActivatedKyc is supported and document the expected external-provider flow, including a reference implementation if that is in scope.

Written by the indexing model from the issue text.