SecretsManager: are any of these kids known?

[dbluhm]

didcomm-messaging-python/didcomm_messaging/didcomm.py

Lines 62 to 65 in 3c7bf0e

	for kid in wrapper.recipient_key_ids:
	recip_key = await self.secrets.get_secret_by_kid(kid)
	if recip_key:
	break

This chunk of code is potentially problematic when there are many recipients. We should have a way to query the SecretsManager with a list of potentially known kids, returning a list of the ones that are known.