v0.1.0

1. The getDid, getIdentityByAlias and createDid method return IdentityAccount instead of Account.
2. IdentityAccount has been added as a helper class to bind encryption and credential related methods to a did conveniently, preventing the need to pass arround an Account each time you need to do something with an identity.
   instead of having to

const identityManager = IdentityManager.newInstance({ ...props });
// did here was of type `Account`
const did = await identityManager.createDid("foobar");
await identityManager.attachSigningMehtod(did, "signing-method");

we can do

const identityManager = IdentityManager.newInstance({ ...props });
// did here is of type `IdentityAccount`
const did =  identityManager.createDid("foobar");
did.attachSigningMethod("#signing-method");

3. credentials have been moved to be under IdentityAccount instead of IdentityManager
4. credentials.create() method now takes a single object of props which is of type ICreateCredentialProps
5. credentials.create() method now uses the new RevocationBitmap2022 technique to issue a credential.
6. credentials.revokeCredential() method now take a keyIndex as parameter instead of a Credential
7. Added attachEncryptionMethod, encryptData and decryptData methods to IdentityAccount.