Interface ChunkOptimizationOptions

Avoid emitting redundant chunk loads for dynamic entries.

This pass can reduce dynamic-entry dependent chunks when the shared modules are guaranteed to be loaded by every importer of that dynamic entry.

Merge common chunks into existing entry chunks when it is safe.

This can reduce the number of emitted chunks by moving shared/common modules into an entry chunk that already depends on them. Rolldown only applies the merge when it does not create a circular chunk dependency or change strict entry export signatures. This pass also covers safe empty-facade cleanup.