https: disallow boolean types for key and cert options

[jimmycann]

This is my first PR on the Node repository, your feedback is greatly appreciated.

When using https.createServer, passing boolean values for key and cert properties in the options object parameter doesn't throw an error an could lead to potential issues if they're accidentally passed.

This PR aims to throw a reasonable error if a boolean was passed to either of those properties.

Fixes: #12802

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

https