perf(@angular/build): default chunk optimization to use Rolldown

[clydin]

Now that Rolldown is stable, swap the default chunk optimizer from Rollup to Rolldown to utilize native compilation benefits and optimize heap memory usage.

Rollup remains an optional peer dependency of @angular/build, allowing users to opt back into Rollup by setting the environment variable NG_BUILD_CHUNKS_ROLLDOWN=false if it is also installed in the project.

[gemini-code-assist]

Code Review

This pull request switches the default chunk optimizer from Rollup to Rolldown by setting 'useRolldownChunks' to default to 'true'. As a result, 'rollup' is transitioned to an optional peer dependency and is dynamically imported only when Rolldown is disabled. Feedback on the changes highlights a TypeScript compilation issue where the dynamically imported 'rollup' variable is declared without a type annotation, resulting in an implicit 'any' type under strict settings.

[clydin]

This PR was merged into the repository. The changes were merged into the following branches:

• main: 585d08a

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