1. Update the API to accept the credentials on input instead of credential manager.
2. Update the test with values using the LDT encryption.
These changes allow us to have a more asynchronous implementaion.
When broadcasting we can:
1. Fetch the private credentials asynchronously.
2. Create the advertisement and start broadcasting when the credentials have been fetched.
When scanning we can:
1. Fetch public credentials asynchronously.
2. Start scanning for advertisements.
3. Update the decoder when new credentials are fetched.
PiperOrigin-RevId: 493998041
We are still missing the real LDT implementation, so the code is linked with a
placeholder code that doesn't do the actual encryption.
We also needed to pass the `account_name` to credential manager to choose the
correct credentials.
PiperOrigin-RevId: 483801163
hai007