[@rollup/plugin-alias] Allow to configure alias based on entry point

[Et7f3]

• Rollup Plugin Name: @rollup/plugin-alias
• Rollup Plugin Version: 5.1.0

Feature Use Case

We have a portion of UI that is accessible only to a part of our user and another part accessible only to other part. In this case we want to avoid exposing UI because all buttons won't be functional, we also want to avoid downloading the chunk of code not related to our user kind. We could do this dynamically with boilerplate but it will complexify the code and be less optimal.

Feature Proposal

Allow to specify alias based on entry selected. If you want to see other thought vitejs/vite#16685 might provides informations (because I opened there but we come to the conclusion is it not asked in the right project). Maybe this issue need to be moved to rollup core directly.