hotfix: contexts

[aidenybai]

Please describe the changes this PR makes and why it should be merged:

This PR fixes contexts by reimplementing the root system to portal based system.

Status

• Code changes have been tested against prettier, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• This PR changes the codebase
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• This PR only includes non-code changes, like changes to documentation, README, etc.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
million-kitchen-sink	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2023 0:58am
sink	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2023 0:58am

[coveralls]

Pull Request Test Coverage Report for Build 5915301419

• 7 of 256 (2.73%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.5%) to 26.195%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
packages/million/block.ts	5	9	55.56%
packages/compiler/react/transform.ts	2	247	0.81%

Totals
Change from base Build 5913624994:	-0.5%
Covered Lines:	1271
Relevant Lines:	5044

---

💛 - Coveralls

[AbhiPrasad]

Two things that come to mind are:

1. This approach might break SSR.
2. This introduces the possibility of nested portals right? Do we need to avoid that scenario?

Otherwise generally this looks good, hard for me to examine in more detail without more test apps though.

[AbhiPrasad]

Is there a way we can feature flag this to make it easier to test? Like we switch to the portal approach with an opt-in flag, ask people to test and then switch to this once we have more confidence.

[oliverloops]

I reviewed the core block re-implementation and see everything fine, I just have a couple of questions around this portal based system:

• What's the main purpose or migrate from the old one?
• This could make harder to make it compatible with 3rd party UI libraries and the future cross file blocks feature?

[aidenybai]

going to run some beta tests