Add --preserveValueImports (#44619)

* Add compiler option

* Require es2015+

* Do not elide any imports or exports in preserve-exact

* Add errors for writing imports/exports that reference elided names

* Improve diagnostics wording

* Update API baselines

* Redo as noEraslingImportedNames

* Update option category

* Update baselines

* Lint

* Fix up transformer comments

* Fix errors from merge

* Update other error code baseline

* Rename to "preserveValueImports"

* Clean up, reword diagnostics

* Update API baselines

* Update other baseline affected by error message reword

* Update tsconfig baselines

* Add debug assertion instead of !

src/compiler/commandLineParser.ts

@@ -571,7 +571,7 @@ namespace ts {
             type: new Map(getEntries({
                 remove: ImportsNotUsedAsValues.Remove,
                 preserve: ImportsNotUsedAsValues.Preserve,
-                error: ImportsNotUsedAsValues.Error
+                error: ImportsNotUsedAsValues.Error,
             })),
             affectsEmit: true,
             affectsSemanticDiagnostics: true,
@@ -1169,6 +1169,14 @@ namespace ts {
             description: Diagnostics.Emit_ECMAScript_standard_compliant_class_fields,
             defaultValueDescription: Diagnostics.true_for_ES2022_and_above_including_ESNext
         },
+        {
+            name: "preserveValueImports",
+            type: "boolean",
+            affectsEmit: true,
+            category: Diagnostics.Emit,
+            description: Diagnostics.Preserve_unused_imported_values_in_the_JavaScript_output_that_would_otherwise_be_removed,
+        },
+
         {
             name: "keyofStringsOnly",
             type: "boolean",