[FileExplorer]GcodeThumbnailProvider and GcodePreviewHandler (#14827)

* Adds the GcodeThumbnailProvider

* Registers the GcodeThumbnailProvider

* Adds Settings support

* Reverts solution changes back to original

* Corrects "Gcode" text with "G-code"

* Adds gcode thumbnail setting description

* Follow up on PR review comments

* Adds GcodePreviewHandler

* Follow up on PR review comments

* Renames assemblies following #14903

.github/actions/spell-check/excludes.txt

@@ -12,6 +12,7 @@ ignore$
 \.bmp$
 \.dat$
 \.dll$
+\.gcode$
 \.gif$
 \.gitignore$
 \.ico$

.github/actions/spell-check/expect.txt

@@ -140,12 +140,14 @@ backend
 backtracer
 bak
 bbwe
+bca
 bcc
 bck
 Bcl
 BEGINLABELEDIT
 betadele
 betsegaw
+bfee
 BGR
 bgra
 BGSOUNDS
@@ -696,6 +698,8 @@ Gamebar
 GBs
 GCLP
 gcnew
+gcode
+gcodepreviewhandler
 gdi
 gdiplus
 GDISCALED