feat: print Dev Server URL on 'u' keypress to reduce terminal clutter

[HTGA75]

• This is a feature

For Bugs and Features; did you add new tests?

No new tests. This is a developer‑experience enhancement only.

Motivation / Use-Case

Sometimes the Dev Server URL scrolls out of view in busy terminals, making it hard to grab.
This change adds a new printUrlOnKeypress option (default false) that, when enabled, registers a keypress listener. Pressing u in the terminal will reprint the current Dev Server URL, reducing noisy automatic logs while still keeping the URL readily accessible.

Addresses discussion in #4907

Breaking Changes

None

Additional Info

• The option is gated behind:

  devServer: {
    printUrlOnKeypress: true
  }

[HTGA75]

👋 Hey @alexander-akait (or @webpack/collaborators), my branch is now up-to-date. Could someone please approve and run the CI workflows, and take a look at the changes? Thanks!