Command for quickly inserting current date from default calendar

[sholder]

Pull Request Description

Adds a new command as describe. This will enable it to be bound to hotkeys, etc. as users desire.

Changes Proposed

Registers new command in main.ts, along with implementation.

Related Issues

This is related to #133, my original intention was to address that but just being able to quickly view the current date was a pre-requisite.

Checklist

• I have read the contribution guidelines and code of conduct.
• I have tested the changes locally and they are working as expected.
• I have added appropriate comments and documentation for the code changes.
• My code follows the coding style and standards of this project.
• I have rebased my branch on the latest main (or master) branch.
• All tests (if applicable) have passed successfully.
• I have run linters and fixed any issues - N/A
• I have checked for any potential security issues or vulnerabilities.

BEGIN_COMMIT_OVERRIDE
feat: Adds command for quickly inserting current date from default calendar
END_COMMIT_OVERRIDE