proposal: stabilize `std/assert`

[iuioiua]

Requirements:

• [ ] 100% documented, passing deno doc --lint checks and adhering to the documentation guidelines.
• [x] Maximum possible test coverage
• [ ] No open issues or pull requests that might lead to breaking changes. For example, issues that suggest new non-breaking features are fine to exist at stabilization.
• [ ] Publish 1.0.0-rc.1
• [ ] Wait 1 month for feedbacks
• [ ] Publish 1.0.0

Blockers:

• [ ] #4716
• [ ] #3771
• [ ] #3513

Towards #4600