[Feature]: Passkey - Optimize P256 signature verification

[aramikm]

Details

Currently P256 signature verification is around 22 times heavier compared to a Sr25519 one in WASM and 6 times heavier in native code. We would like to optimize the verification in WASM as much as possible to be closer to native one.

blocked by

• due to the details mentioned in https://substrate.stackexchange.com/questions/11690/custom-hosted-functions first we should be able to add these as hosted function into polkadot nodes.

Approach

• Checking host functions and API and see if can utilize

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