Add $ as a surround character (#8895)

[cjohnson19]

What this PR does / why we need it:

This PR adds $ as a "quote"-like character to support surround and bracket-like actions (e.g. yi$, ysi$}). These actions are supported by vim surround, so users expect this to line up when interacting with VSCodeVim.

Which issue(s) this PR fixes

Fixes #8895

Special notes for your reviewer:

This creates a weird mismatch between the names for Quote behavior, since it now supports a $. The naming for "quotes" makes sense given things like diq, but I think in essense the quote matching really lines up with a "directionless" behavior.

[J-Fields]

Is $ a special character treated like a quote, or does this work for any character in Vim surround?

[cjohnson19]

That's a great question, and one I didn't consider previously. Looks like vim-surround will treat any non-alphabetic character as a valid surrounding target. From the documentation:

Undefined replacement characters (with the exception of alphabetic characters) default to placing themselves at the beginning and end of the destination, which can be useful for characters like / and |.