Support for AWS::SES::EmailIdentityPolicy

### Name of the resource

Other

### Resource name

AWS::SES::EmailIdentityPolicy

### Description

Currently there is no way to assign a policy to an email identity to allow other accounts/resources to send emails on your email identity. It would be nice if we can manage these policies through CloudFormation to prevent configuration issues when switching accounts

API:
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sesv2/client/create_email_identity_policy.html

### Other Details

_No response_

Start by reviewing the linked boto3 create_email_identity_policy API documentation and the CloudFormation coverage conventions for AWS::SES resources. Done means CloudFormation can manage AWS::SES::EmailIdentityPolicy so policies can be assigned to email identities across accounts; this issue names no repository files or tests.

Written by the indexing model from the issue text.