Add new `isPasskeyPlatformAuthenticatorAvailable()`
Describe the issue
https://github.com/w3c/webauthn/pull/1901 is adding a new PublicKeyCredential.isPasskeyPlatformAuthenticatorAvailable() to offer RP's a signal that users will likely be able to use a passkey via the local platform authenticator, or via hybrid authentication.
Reproduction Steps
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Expected behavior
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Code Samples + WebAuthn Options and Responses
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Dependencies
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SimpleWebAuthn Libraries
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Additional context
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Update: this method is being removed from WebAuthn in https://github.com/w3c/webauthn/pull/1936, but there's no reason I couldn't still add a method of this name to this project using the proposed getClientCapabilities() API that's being proposed in https://github.com/w3c/webauthn/pull/1923.
Is the return value going to be undefined when passkeyPlatformAuthenticator is not present in getClientCapabilities()?