1009 id verification required endpoint

[eastandwestwind]

Purpose

Adds endpoint to determine whether subject identity is required. Also returns whether or not email service has been configured, which is required for subject identity verification.

Endpoint: GET {{host}}/id-verification/config/

Example response:

{
    "identity_verification_required": true,
    "valid_email_config_exists": false
}

Changes

• Adds new endpoint for id verification config
• Adds unit tests for endpoint
• Updates postman collection

Checklist

• Update CHANGELOG.md file
  • Merge in main so the most recent CHANGELOG.md file is being appended to
  • Add description within the Unreleased section in an appropriate category. Add a new category from the list at the top of the file if the needed one isn't already there.
  • Add a link to this PR at the end of the description with the PR number as the text. example: #1
• Applicable documentation updated (guides, quickstart, postman collections, tutorial, fidesdemo, database diagram.
• If docs updated (select one):
  • documentation complete, or draft/outline provided (tag docs-team to complete/review on this branch)
  • documentation issue created (tag docs-team to complete issue separately)
• Good unit test/integration test coverage
• This PR contains a DB migration. If checked, the reviewer should confirm with the author that the down_revision correctly references the previous migration before merging
• The Run Unsafe PR Checks label has been applied, and checks have passed, if this PR touches any external services

Ticket

Fixes #1009

[eastandwestwind]

mypy check was giving the following error:

src/fidesops/ops/graph/config.py:309: error: The erased type of self
"fidesops.ops.graph.config.ObjectField" is not a supertype of its class
"Type[fidesops.ops.graph.config.ObjectField]"  [misc]
        def validate_data_categories(
        ^
Found 1 error in 1 file (checked [19](https://github.com/ethyca/fidesops/runs/8097316393?check_suite_focus=true#step:5:20)8 source files)

[eastandwestwind]

Back over to you @sanders41 !