Add device signer

[broody]

To integrate webauthn signer into Controller we need to able to trigger device signing/registration from wasm. Currently, only a P256 signer is supported. This PR adds another signer called device and uses the simple wasm-webauthn crate to sign and register.

This is just simple integration to get things working, perhaps it would be best later to adapt wasm-webauthn to our codebase for more control / better testing.

[piniom]

It seems ok to me.
The public_key_bytes method is a minor thing.

[codecov]

Codecov Report

Attention: Patch coverage is 30.66667% with 104 lines in your changes are missing coverage. Please review.

Project coverage is 64.14%. Comparing base (48381d7) to head (cf0bed1).

Files	Patch %	Lines
.../account_sdk/src/webauthn_signer/signers/device.rs	0.00%	103 Missing ⚠️
.../account_sdk/src/webauthn_signer/signers/p256r1.rs	97.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
- Coverage   70.65%   64.14%   -6.52%     
==========================================
  Files          16       16              
  Lines        1077     1163      +86     
==========================================
- Hits          761      746      -15     
- Misses        316      417     +101     

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