add support to convert lambda to function and vice-versa (#28250)

* add skeleton

* add getAvailableActions

* add working getEditsForAction

* add multi vardecl

* fix multi decl bug

* change refactor name

* add tests for ToAnon, ToArrow and available arrow

* add tests for ToNamed and available anon

* add tests for ReturnType and available Arrow as FnParam

* fix bug modifiers by toNamed

* add tests for modifiers

* fix for tslint error

* adapt one test case

* refactor getInfo getAvailableActions

* refactor small progress

* extract creation of block

* extract creation of funcDeclaration

* make guideline compliant

* apply feedback from pr

* add testcase and apply feedback from pr

* apply feedback from pr

* add newline

* rename testcases

* Make conditions more expressive

* fix for unnecessary duplication of comment

* apply feedback from pr

* update getAvailableActions

* check if functionExpression name is used

* add more testcases

* do not provide refactoring when it contains this
because this behaves differently in arrow than in function

* exclude nested functions and classes at containingThis check

* fix linting error

* fix line endings

Co-authored-by: BigAru <arooran@indikon.ch>
Co-authored-by: bigaru <bigaru@users.noreply.github.com>
Co-authored-by: Jesse Trinity <42591254+jessetrinity@users.noreply.github.com>
Co-authored-by: Jesse Trinity <jetrinit@microsoft.com>

src/compiler/diagnosticMessages.json

@@ -5717,6 +5717,22 @@
         "category": "Message",
         "code": 95121
     },
+    "Convert arrow function or function expression": {
+        "category": "Message",
+        "code": 95122
+    },
+    "Convert to anonymous function": {
+        "category": "Message",
+        "code": 95123
+    },
+    "Convert to named function": {
+        "category": "Message",
+        "code": 95124
+    },
+    "Convert to arrow function": {
+        "category": "Message",
+        "code": 95125
+    },
 
     "No value exists in scope for the shorthand property '{0}'. Either declare one or provide an initializer.": {
         "category": "Error",