feat: support https for mock util plugin

[afnx]

This PR will be make it possible to run mock server with HTTPS enabled. HTTPS support for local mock server ensures that we can accurately replicate secure environments during testing phase.

Description of changes

Added the HTTPS option to the amplify mock command. Updated Amplify Appsync Simulator to create a HTTPS server when the option is enabled.

For example, amplify mock api --https /path/to/key /path/to/cert will run a local HTTPS server.

Description of how you validated changes

Implemented additional tests.

Checklist

• PR description included
• yarn test passes
• Tests are changed or added
• Relevant documentation is changed or added (and PR referenced)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[sobolk]

Overall this is looking good.

Please make sure that:

yarn lint-check
yarn prettier-check

are passing.

[afnx]

Hi @sobolk Thank you for the review. I updated the code and resolved the issues. Could you take a look?