Expose APIs to fetch local credentials from the CredentialManager, which will be used to fetch a local credential to be used for authentication in follow up CL's. See go/cros-nearby-presence-np-nc-authentication for details.
PiperOrigin-RevId: 601781066
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
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