WT should start up fast: profile the startup path and trim anything that takes a while

Steps to reproduce

1. Click to launch Windows Terminal

Expected behavior

Windows Terminal should be ready instantaneously like windows console, or like Sublime Text.
Windows Terminal can't be slower than windows console.

While Windows Terminal is fast compared with other tools like Visual Studio, or iTunes, it is still not fast enough for a Terminal application.

Actual behavior

It takes too long to startup. It is not ready instantaneously. It's not as fast as windows console.

maintainer note: hijacking OP for task list:

• Use exactly one ColorPickerFlyout for all tabs, and just redirect it to whatever tab activated it.
• Delayload the ColorPickerFlyout.
• Add a setting to disable ALL fragments / dynamic profiles. The app catalog search is expensive.
  • Maybe we can just skip loading dynamic profiles on initial launch, unless we discover that the defaultProfile is a dynamic one... Nah, cause what about for defterm launches that end up matching a dynamic profile.

Start by profiling the Windows Terminal launch path and measuring the app catalog search used for dynamic profiles. The remaining task is to add a setting that disables all fragments or dynamic profiles without breaking launches whose default profile is dynamic, then verify startup behavior and timing.