[Booking] Convert booking process to synchronous

[heitorlessa]

Booking reservations are currently done async after payment authorization is successful.

Since then, Step Functions launched Express Workflow with SyncStartExecution API. This allows us to provide a better customer experience since our end-to-end flow completes within 2-3 seconds.

Minimal changes:

• [ ] Change ProcessBooking state machine from Standard to Express Workflow
• [ ] Split ASL from SAM into its own state machine definition, and use the new DefinitionSubstitutions
• [ ] Enable Tracing (new) and Logging

Depending on how tackle the task:

• [ ] Update front-end to expect a synchronous response, and provide the option to retry if failed within the UI (use max retry too to avoid overloading downstream)

[umairishaq]

@heitorlessa I can take this, per our conversation.