fix(console): improve interactive text input handling

[xHeaven]

This PR fixes a couple of bugs that were bugging me (ba dum ts):

• Previously, if you had multiline help text, the cursor was drawn in the wrong place.
• Previously, if you pressed multiple keys in very quick succession, only one of them would show up in the input... but the rest would reappear once you started deleting backwards.
• Previously, Cmd+Backspace basically behaved like the Spacebar. Now it has a real purpose: deleting the whole line. Additionally, Option+Backspace is now wired up to the deletePreviousWord method.
• Previously, multibyte characters and emojis would trip up the input entirely. Typing would (maybe) work, but deleting backwards was a s��tfest.
• Previously, while you were typing into the input box, the cursor would cause a seizure to the viewer by flashing all over the place at the bottom of the rendered content.

[github-actions]

Benchmark Results

Comparison of console against 3.x (1f0085cda591d0c3e9b89d67b1b33849979c8ef1).

Open to see the benchmark results

No benchmark changes above ±5%.

_{Generated by phpbench against commit 6c1ae76}