Add endpoint to list clients

[c-w]

This change required a data migration:

import json
import os
import uuid

from opwen_email_server import config
from opwen_email_server.constants import azure as constants
from opwen_email_server.services import storage

storage_account = os.environ['STORAGE_ACCOUNT']
storage_key = os.environ['STORAGE_KEY']

old_storage = storage.AzureTextStorage(
    account=storage_account,
    key=storage_key,
    host=config.TABLES_HOST,
    secure=config.TABLES_SECURE,
    container=constants.TABLE_AUTH,
    provider=config.STORAGE_PROVIDER,
)

new_storage = storage.AzureObjectStorage(
    account=storage_account,
    key=storage_key,
    host=config.TABLES_HOST,
    secure=config.TABLES_SECURE,
    container=constants.TABLE_AUTH,
    provider=config.STORAGE_PROVIDER,
)

auths = []

for resource_id in old_storage.iter():
    try:
        uuid.UUID(resource_id, version=4)
    except ValueError:
        domain = resource_id
        auth = old_storage.fetch_text(resource_id)
        try:
            auth = json.loads(auth)
        except json.JSONDecodeError:
            client_id = auth
            owner = None
        else:
            client_id = auth['client_id']
            owner = auth['owner']
        auths.append({'owner': owner, 'domain': domain, 'client_id': client_id})

for auth in auths:
    client_id = auth['client_id']
    domain = auth['domain']
    new_storage.store_object(f'client_id/{client_id}', auth)
    new_storage.store_object(f'domain/{domain}', auth)