moduleResolution: node12 support (#45884)

* Initial support for module: node12

* Add allowJs and declaration emit enabled tests

* Fix typos

* cts, mts, cjs, mjs, etc extension support

* Fix watch of files whose intepretation changes due to a package.json update

* Minor PR feedback

* Adjust error message

* Initial import/export/self-name support

* Accept new error codes

* TypesVersions support in export/import map conditions

* Fix import suggestion and autoimport default extensions under new resolution modes

* Add tests for import maps non-relative name lookup feature

* Fix isDeclarationFileName for .d.mts and .d.cts

* Preserve new extensions when generating module specifiers

* Fix spurious implict any suggestion caused by file ordering bug and optimize import name format detection by relying on parents being set

* Fix a bunch of incremental bugs that dont repro under fourslash for some reason

* Accept updated baseline

* Always include extensions on completions for cjs/mjs style imports

* String completion relative import suggestions respect the mode of the import when choosing if they provide extensions

* Style feedback

* Change diagnostic case

src/executeCommandLine/executeCommandLine.ts

@@ -43,10 +43,10 @@ namespace ts {
         }
 
         const path = file.path;
-        if (fileExtensionIsOneOf(path, supportedTSExtensions)) {
+        if (fileExtensionIsOneOf(path, supportedTSExtensionsFlat)) {
             return "TypeScript";
         }
-        else if (fileExtensionIsOneOf(path, supportedJSExtensions)) {
+        else if (fileExtensionIsOneOf(path, supportedJSExtensionsFlat)) {
             return "JavaScript";
         }
         else if (fileExtensionIs(path, Extension.Json)) {