Use more nodelike paths for import types when possible (#24610)

* Use more nodelike paths for import types when possible

* move functionality from services into compiler, fix with propert file/directory conflict handling

* mark suspect cast

src/compiler/program.ts

@@ -1207,6 +1207,9 @@ namespace ts {
                 writeFile: writeFileCallback || (
                     (fileName, data, writeByteOrderMark, onError, sourceFiles) => host.writeFile(fileName, data, writeByteOrderMark, onError, sourceFiles)),
                 isEmitBlocked,
+                readFile: f => host.readFile(f),
+                fileExists: f => host.fileExists(f),
+                ...(host.directoryExists ? { directoryExists: f => host.directoryExists!(f) } : {}),
             };
         }