Prebuild pages in the background on the development environment

[cw1997]

Goals

1. Once I run next dev, Next.js starts pre-building all pages in the background at low priority, I hope it will not impact performance (for example we could config the background building threads or CPU & RAM's usage), and will not waste the developer's time to wait for building while navigating to a new page
   RAM

Non-Goals

No response

Background

Now, once I run next dev, Next.js will not build any page before I visit any pages(including page router and app router). This results in wasting time waiting for the first page to be built, and while I navigate to another page, I also need to wait for a long time before Next.js builds it.

Proposal

We could run a pages building thread and maintain a task queue of pages building tasks in the background.
In the future, we could store the high-frequency developing page list or recently developed pages to the ".next", then we could build the pages in the order of the priority list.