Add default to Collection Attributes in Migration

[ItzNotABug]

What does this PR do?

Adds the default to collection attributes during migration.

Test Plan

Manual.

1. 1.4.13 -

   

2. Upgraded to a local 1.5.7 & ran docker exec appwrite migrate -

   

3. _metadata -

   

4. topics table with defaults -

   

Related PRs and Issues

• 🐛 Bug Report: Topic Shows 0 Subscribers #7892.

Checklist

• Have you read the Contributing Guidelines on issues?
• If the PR includes a change to an API's metadata (desc, label, params, etc.), does it also include updated API specs and example docs?

[ItzNotABug]

The Database & Function tests seems to pass locally -

---

---

[ItzNotABug]

Not sure why the tests keep failing on Functions continuously.

I'll update the branch and run the tests locally for once and check.

I believe the time-out based test often fails on GitHub.