Alt+<Keys> should behave like Esc, <Keys> in sequence

Is your feature request related to a problem? Please describe.
In nearly all terminal emulators I've used, I can with the default configuration press Alt+<keys> as a more ergonomic way to press Esc and then <keys>.

This trick is possible because of how terminals encode Esc and Alt. They are basically the same, except Esc is a sticky Alt.

For example, Alt+Space leaves insert mode without moving the cursor backward. Alt+J and Alt+K can be used to start moving vertically. Alt+Shift+; (equivalent to Esc, :) can be used to start entering a new command.

It's a little jarring to my muscle memory when it doesn't work in VSCode

Describe the solution you'd like
For any Alt+<keys> sequence not intercepted by the OS, browser, or VSCode bindings, it should be handled equivalently to Esc, <keys>

Describe alternatives you've considered
Binding every possibility manually: This is obviously inconvenient but works for ones I can think of beforehand.

The more complicated the configuration process is, the more I tend to convince myself I should deal with the defaults.

Additional context
I'm not the only one with this habit: https://github.com/VSCodeVim/Vim/issues/7436

Start by investigating how VSCodeVim receives and processes Alt key sequences, including which sequences are intercepted by the OS, browser, or VSCode bindings. Done means an unhandled Alt+keys sequence behaves like Esc followed by those keys, while existing bindings and intercepted sequences remain unchanged.