Configurable engine library name

### Use case

I use flutter to develop on the windows platform. When I published it, I found a file named flutter_windows.dll in the program directory. I think my users may infer that my program is developed by flutter based on this name. This is very useful to me. The program security is very disadvantageous, so I want to change the name of this file to another name so that users cannot guess the development language and framework I use based on this file. But I haven't found a better way to modify it so far. So I hope this name is configurable, which may be more beneficial to program security.

### Proposal

Flutter 3.16.5 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 78666c8dc5 (5 weeks ago) • 2023-12-19 16:14:14 -0800
Engine • revision 3f3e560236
Tools • Dart 3.2.3 • DevTools 2.28.4