feat: Support \Braket, \set, and \Set (#3214)

* feat: Support \Braket, \set, and \Set

* Update screenshots.

* Rewrite to redefine | via macros

* Update screenshot after merge

* Rename \bra@ket@one -> \bra@set

* Fix spacing in \set and \Set to match braket.sty

* Add || and \| support

* Update tests

* Update screenshots

Co-authored-by: Ron Kok <ronkok@comcast.net>

docs/support_table.md

@@ -193,6 +193,7 @@ table td {
 |\Bra|$\Bra{\psi}$|`\Bra{\psi}`|
 |\bra|$\bra{\psi}$|`\bra{\psi}`|
 |\braket|$\braket{\phi\vert\psi}$|`\braket{\phi\vert\psi}`|
+|\Braket|$\Braket{ ϕ \| \frac{∂^2}{∂ t^2} \| ψ }$| `\Braket{ ϕ \| \frac{∂^2}{∂ t^2} \| ψ }`|
 |\brace|${n\brace k}$|`{n\brace k}`|
 |\bracevert|<span style="color:firebrick;">Not supported</span>||
 |\brack|${n\brack k}$|`{n\brack k}`|
@@ -953,6 +954,8 @@ use `\ce` instead|
 |\searrow|$\searrow$||
 |\sec|$\sec$||
 |\sect|$\text{\sect}$|`\text{\sect}`|
+|\set|$\set{x\|x<5}$|`\set{x\|x<5}` |
+|\Set|$\Set{ x \| x<\frac 1 2 }$ | `\Set{ x \| x<\frac 1 2 }` |
 |\setlength|<span style="color:firebrick;">Not supported</span>|[Issue #687](https://github.com/KaTeX/KaTeX/issues/687)|
 |\setminus|$\setminus$||
 |\sf|$\sf AaBb123$|`\sf AaBb123`|