[w3ctag/design-reviews] Incubation: speculation rules `form_submission` field for prerendering (Issue #1192)

robertlin-chromium created an issue (w3ctag/design-reviews#1192)

### Explainer

https://github.com/WICG/nav-speculation/blob/main/prerendering-form-submission.md

### The explainer

- [x] Includes the information requested by the [Explainer Explainer](https://w3ctag.github.io/explainer-explainer/#introduction).
- [x] Follows the [Web Platform Design Principles](https://www.w3.org/TR/design-principles/).
- [x] Includes or links to answers to the [Security/Privacy Questionnaire](https://www.w3.org/TR/security-privacy-questionnaire/).
- [x] Describes user research you did to validate the problem and/or design.

### Where and by whom is the work is being done?

- GitHub repo: https://github.com/WICG/nav-speculation
- Primary contacts:
  - Robert Lin ([@robertlin](https://github.com/robertlin-chromium)), Google
  - Hiroki Nakagawa ([@nhiroki](https://github.com/nhiroki)), Google
- Organization/project driving the design: Google Chrome
- This work is being funded by: Google
- Incubation and standards groups that have discussed the design:
- Standards group(s) that you expect to discuss and/or adopt this work when it's
  ready: unknown


### Feedback so far

- Multi-stakeholder feedback:
  - Chromium comments:
  - Mozilla comments: [https://github.com/mozilla/standards-positions/issues/1355 <!-- And/or other places they've given feedback -->](https://github.com/mozilla/standards-positions/issues/1355)
  - WebKit comments: [https://github.com/WebKit/standards-positions/issues/614 <!-- And/or other places they've given feedback -->](https://github.com/WebKit/standards-positions/issues/614)
- Major unresolved issues with or opposition to this design:


### You should also know that...

こんにちは TAG-さん!
I'm requesting a TAG review of a new field `form_submission` for speculation rules prerendering.
This extends speculation rules syntax to allow developers to specify the form_submission field for prerender.

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