Search In Open Editors (#107756)

* Initial work on "search in open editors"

* Update wording

* Update messaging for open editors config

* Add command to open all git changes (in association with searching in all open editors)

* Add strict parsing mode to search using providers for specific files

* Clean

* Remove log

* Naming

* Transfer open editors config to search editor

* Pass in more places

* Add some testing

extensions/git/package.json

@@ -71,6 +71,11 @@
         "category": "Git",
         "icon": "$(compare-changes)"
       },
+      {
+        "command": "git.openAllChanges",
+        "title": "%command.openAllChanges%",
+        "category": "Git"
+      },
       {
         "command": "git.openFile",
         "title": "%command.openFile%",