Add javascript response formatters as a package?

[Firehed]

There are two small but important pieces of JS code that are format specific, for the credentials.create and credentials.get response parsing. It would be beneficial to publish these (as a NPM package, presumably) to ensure the conversion process is reliable.

Something like this:

export const parseAttestation = (attestation: AuthenticatorAttestationResponse) => ({
    rawId: Array.from(new Uint8Array(attestation.rawId)),
    type: credential.type,
    attestationObject: Array.from(new Uint8Array(attestation.attestationObject)),
    clientDataJSON: Array.from(new Uint8Array(attestation.clientDataJSON)),
})

export const parseAssertion = (assertion: AuthenticatorAssertionResponse) => ({
    rawId: Array.from(new Uint8Array(assertion.rawId)),
    type: assertion.type,
    authenticatorData: Array.from(new Uint8Array(assertion.authenticatorData)),
    clientDataJSON: Array.from(new Uint8Array(assertion.clientDataJSON)),
    signature: Array.from(new Uint8Array(assertion.signature)),
    userHandle: Array.from(new Uint8Array(assertion.userHandle!)),
})

[Firehed]

I feel this is obsolete with #41 - that's pretty clearly a superior direction that will have better native support and require less maintenance on my end.