### Changes
- Implement `salvo_oapi::Extractible` and `salvo_oapi::EndpointArgRegister`
for `PublicKey`
- Implement `salvo_oapi::Extractible` and `salvo_oapi::ToParameters` for `Signature`
### Notes
I did not implement `salvo_oapi::ToParameters` for `PublicKey` because it will
not be used as an OpenAPI parameter. Instead, Salvo will register it using the
`EndpointArgRegister` trait.
Similarly, I did not implement `salvo_oapi::EndpointArgRegister` for `Signature`
because it will not be used as an argument in the endpoint. Instead, the
signature will be verified by the signature middleware, and we will only use it
as a parameter.
Reviewed-by: Amjad Alsharafi <me@amjad.alsharafi.dev>
Reviewed-on: #33
Fixes: #21
Helped-by: Amjad Alsharafi <me@amjad.alsharafi.dev>
Signed-off-by: Awiteb <a@4rs.nl>
