feat: add Twilio SMS destination

[PFCAaron12]

What does this PR do?

1. drt/destinations/twilio.py — Send SMS via Twilio API

2. Auth via Account SID + Auth Token (Basic auth)

3. Jinja2 template for message body
   from_number and to_template (per-row phone number)

4. Unit tests with mocked HTTP client

5. Added to drt/cli/main.py

6. Twilio requires E.164 format for phone numbers so validation for this was added to twilio.py

Related Issue

Closes: # 159

Checklist

• Tests pass (make test)
• Linter passes (make lint)
• Updated CHANGELOG.md (if user-facing change)

[codecov]

Codecov Report

❌ Patch coverage is 90.12346% with 8 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
drt/cli/main.py	0.00%	3 Missing ⚠️
drt/config/models.py	83.33%	3 Missing ⚠️
drt/destinations/twilio.py	96.66%	2 Missing ⚠️

📢 Thoughts on this report? Let us know!

[masukai]

🎉 Clean Twilio implementation — the E.164 validation for both from_number (upfront) and to_number (per-row) is a thoughtful touch that prevents silent delivery failures. Template-based message body + per-row phone targeting is a solid design.

I pushed a small ruff fix (unused import, line length, import ordering) — no action needed from your side.

Three connectors in a day is impressive momentum @PFCAaron12 — great to see this level of engagement! If you enjoy using drt, a ⭐ on the repo would be appreciated 🙏