identity: Add support for ECDSA auth and don't require session encryption.

This adds a new method which allows applications to use mdoc ECDSA
authentication instead of mdoc MAC authentication. Additionally, also
relax requirements on SessionTranscript so the APIs can be used even
when mdoc session encryption isn't being used.

Also add new VTS test to check for this.

Since this is new API, bump API version to 5 and the Identity
Credential feature version to 202301.

Bug: 241912421
Test: atest VtsHalIdentityTargetTest
Test: atest android.security.identity.cts
Change-Id: I4085a89be0382c10f5449e13c6a92a46c74c225d