(DO NOT MERGE YET) [Workflows] Add step context with attempt count

[pombosilva]

Fixes WOR-1054.

Adds step context with attempt count for step.do() callbacks. This allows to access the current step attempt number within their step (this is 1-indexed).

This change is backward compatible with JS workflows, however it would break Python workflows - here is the PR to prevent that.

Types will be added in a follow-up PR to workerd.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: We will add after all changes get released (internal + workerd)

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

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Latest commit: dde1dd2

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commit: dde1dd2