Rewrite the MSAA/UIA integration into conhost (#19344)

Goal: Remove `CursorBlinker`.
Problem: Spooky action at a distance via `Cursor::HasMoved`.
Solution: Moved all the a11y event raising into `_stream.cpp` and pray
for the best.

Goal: Prevent node.js from tanking conhost performance via MSAA (WHY).
Problem: `ServiceLocator`.
Solution: Unserviced the locator. Debounced event raising. Performance
increased by >10x.
Problem 2: Lots of files changed.

This PR is a prerequisite for #19330

## Validation Steps Performed
Ran NVDA with and without UIA enabled and with different delays. ✅

.github/actions/spelling/expect/expect.txt

@@ -807,6 +807,7 @@ IMPEXP
 inbox
 inclusivity
 INCONTEXT
+INDEXID
 INFOEX
 inheritcursor
 INITCOMMONCONTROLSEX
@@ -908,6 +909,7 @@ LNM
 LOADONCALL
 LOBYTE
 localappdata
+LOCATIONCHANGE
 locsrc
 Loewen
 LOGBRUSH
@@ -1033,6 +1035,7 @@ MOUSEACTIVATE
 MOUSEFIRST
 MOUSEHWHEEL
 MOVESTART
+msaa
 msb
 msbuildcache
 msctls
@@ -1973,8 +1976,8 @@ WRITECONSOLEINPUT
 WRITECONSOLEOUTPUT
 WRITECONSOLEOUTPUTSTRING
 wrkstr
-WRL
 wrl
+WRL
 wrp
 WRunoff
 WSLENV