FED-2298 Add ReactNode typedef

[aaronlademann-wf]

Motivation

In React, a "React node" is a value that can be returned from a component's render or used as children, and contains more values than just ReactElement.

TypeScript captures this type as a ReactNode type

• https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/react/v17/index.d.ts#L214
• https://github.com/facebook/react/blob/b3003047101b4c7a643788a8faf576f7e370fb45/packages/shared/ReactTypes.js#L10

Now that Dart has type aliases (in SDK 2.13 and up), can name this type so that consumers can be more expressive in how they type their code (and also to help them avoid using ReactElement, which in some cases is overly restrictive).

Changes

• Add ReactNode typedef, which is an alias for Object?.
• Use this new typedef where appropriate

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure

• Verify aviary.yaml coverage of security relevant code

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