Add cash tracking session event targets for POS Compliance

[fatbattk]

Background

Part of, https://github.com/Shopify/pos-next-react-native/issues/51030

Solution

• Rename event-initiated extension targets per https://github.com/Shopify/pos-next-react-native/issues/51181
• Add 3 cash tracking session targets for POS Compliance.
  • pos.cash-tracking-session-start.event.observe
  • pos.cash-tracking-session-cancel.event.observe
  • pos.cash-tracking-session-complete.event.observe
• Added preliminary inputs for Cash session object.
• Add to docs.

🎩

• TODO: how?

Checklist

• I have 🎩'd these changes
• I have updated relevant documentation

[vctrchu]

LGTM, the naming this aligns with the POS targets sheet. We can add more properties as you expand the scope

[js-goupil]

Sorry for RC, PR looks good, just wanted to raise the alarm on a decision we're also making for the PurchaseCompleteInput as well

[js-goupil]

I think we should move this into an object as such:

export interface CashTrackingSessionEndInput extends BaseInput {
   cashTrackingSessionEnd: {
      id
      /// other fields
   }
}

[js-goupil]

And actually, are these same fields going to be reuseable on other targets? If so maybe we can create a more generically named type, that we can reuse for CashTrackingSesisonEndInput, CashTrackingSessionStartInput, etc

[fatbattk]

nice, cleaner from BaseInput, updated!
these should be limited to cash tracking sessions, will abstract out if useful elsewhere.