Microsoft Mail: Add save_attachments to get_email_by_id

[mikahanninen]

Description

Add the possibility of saving email attachments to a local folder.

How added parameter save_attachments works:

• by default will save into the current working directory.
• if the value downloads is given then attachments are saved in the user's Downloads folder
• can be given local file path, on make_dirs=True this directory structure will be created if it does not exist

How can (was) this tested?

Tested in VS Code and in the Studio.

Screenshots (if needed)

Checklist:

• I have bumped the version number for the Action Package / Agent
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation - README.md file
• I have updated the CHANGELOG.md file in correspondence with my changes
• I have added tests that prove my fix is effective or that my feature works
• OAuth2: I have made sure that action has necessary scopes (works in whitelisted mode)