[REFACTOR] Pipe based app on Firebase

[leomp12]

Replace current app with full scalable one on Firebase using HTTP and scheduled functions and Firestore:

1. HTTP functions only receives webhooks and adds requests/handlers to queue on Firestore;
2. Each Firestore doc will be a queue entry with pipe ID and order, status, Store API request or self HTTP function request;
3. Queue runs on scheduled functions;
4. Firestore doc will be deleted after all pipe done only, marked as fail if one step fails only (may reset and restart);

Closes #3