Add admin API for managing canonical e-mail blocks (#19067)

...rollers/api/v1/admin/canonical_email_blocks_controller.rb

app/helpers/admin/action_logs_helper.rb

app/models/admin/action_log_filter.rb

app/models/canonical_email_block.rb

app/policies/canonical_email_block_policy.rb

...erializers/rest/admin/canonical_email_block_serializer.rb

config/locales/en.yml

config/routes.rb

.../20220827195229_change_canonical_email_blocks_nullable.rb

db/schema.rb

lib/mastodon/canonical_email_blocks_cli.rb