Support LDAP authentication using DEX

**What would you like to be added**:

As a EKSA Admin, I want to group permissions based on Admin vs Write vs Read access and integrate the users with Active Directory for scalability purposes.

**Why is this needed**:

- EKSA do not support LDAP with DEX connector out of the box at this time. Requesting for instructions on how to install DEX and integrate it with Active Directory
- https://anywhere.eks.amazonaws.com/docs/overview/faq/#does-eks-anywhere-support-ldap

Start with the linked EKS Anywhere FAQ and search the repository for existing DEX, LDAP, Active Directory, and permissions guidance. Done would require a decided, documented approach for installing DEX, integrating Active Directory, and grouping EKSA permissions by Admin, Write, and Read access.

Written by the indexing model from the issue text.