Revert "fix(*): export chat in public api - 21.0.x"

[ChronosSF]

Reverts #17168

[Copilot]

Pull request overview

Reverts a prior change that exposed the Chat entry point through the root igniteui-angular public API barrel, returning the root exports to the pre-#17168 state.

Changes:

• Removed the export * from 'igniteui-angular/chat'; re-export from the root projects/igniteui-angular/src/public_api.ts.

[Copilot]

Removing the igniteui-angular/chat re-export from the root igniteui-angular entry point is a breaking change for consumers importing chat symbols from the barrel package (they’ll need to switch to igniteui-angular/chat). It also appears to contradict the documented goal of the main entry point being “fully backwards compatible by re-exporting all granular entry points” (CHANGELOG.md:69-72). If this revert is intentional, consider either keeping the root re-export for compatibility, or explicitly documenting this exception (e.g., release notes / migration guidance) so consumers aren’t surprised.

Suggested change

	export * from 'igniteui-angular/checkbox';
	export * from 'igniteui-angular/checkbox';
	export * from 'igniteui-angular/chat';