websockets : add options for passing keystore password file and truststore password file

[pullurib]

Description
As a Besu user, I want to provide a password file for the keystore and truststore when using WebSocket (WS) so that passwords are not exposed in logs when passed via the CLI.

Acceptance Criteria
Support passing a password file for the keystore through a new option and successfully use the password-protected keystore.
Support passing a password file for the truststore through a new option and successfully use the password-protected truststore.

[pullurib]

self assign