setup test env to handle TextEncoder + IndexedDb

add dev deps for testing

Add IndexedDb store to handle private crypto keys

Add DPoPService and associated cypto + jwt helper functions

Add DPoP settings to UserManagerSettings

Wire up userManager to DPoP functionality for code exchange and refre… …

…sh token

Add tests for DPoPService exception handling

Add test to gover retreiving a proof from the User class

Remove unneccesary nonce code

Add test to cover dpopJkt in SignInRequest settings

Move UserManager dpop test into describe block

Add test coverage to CryptoUtils.customCalculateJwkThumbprint

Refactor DPoPService to non static class

Remove dpopProof method

Add dpopProof method for external consumers

Create DPoPStorageStateStore that extends WebStorageStateStore and im… …

…plements StateStore interface

Re-organise dpop code into CyrptoUtils, DPoPStore and OidcClient

Add tests to cover reorganisation of code

Make DPoPStore implementation optional

Undo changes to StateStore

Simplify DPoPStore interface

Rename IndexDbDPoPStore to IndexedDbDPoPStore

Re-implement dpop key auth code binding

Remove redundant import and dpopstore prop on oidcClient

Add tests for dpop settings

Remove redundant dpopsettings on UserManagerSettings

refactor dpopJkt into private method, add test for signinRedirect

Undo unneccessary changes to UserManager

Tidy up

Fix styling and make dpop.store non optional.

Throw exception if dpop configured without a store

Resolve conflicts with main

Move removal of dpop Keys into UserManager.storeUser when user is null

Remove if statements from tests