Don't call post-send hook in test mode

🩹 Fixes

• don't call post send hook in test mode (bf97bf1)

Add -t switch for test mode

Adds a new test mode to the mail merge tool to allow sending emails to test mail addresses before the real sent

Add --only & moving of drafts

• Adds new --only flag to only send a set number of emails
• Moves draft uploads to a folder to prevent re-upload.

Initial release

The initial release of docsoc-tools.

These tools are included with complete docs:

1. @docsoc/util: common utilities
2. @docsoc/mailmerge: library for mailmerging
3. @docsoc/mailmerge-cli: CLI for mailmerging
4. Rust clickup calendar sync tool