Add client-side passkey wallet generation

[trmid]

Feature

• client-side wallet generation with passkeys
• a site-specific wallet will be created and secured by the device it was created on
• (option to back up wallet to another device?)

Goal

• to enable simple client-side wallet experiences that are completely non-custodial and service independent
• passkey wallet SDKs that exist right now all use additional APIs to backup and provide in-app swap experiences, but this creates extra dependencies that, if broken, can sever the user's ability to access and control their wallet. DSKit has the potential to do this in a completely client-side way, thus providing the user with confidence of longevity.

Out of Scope

• wallet security and recovery will be left up to the implementor and user