reorg: move JS ops implementations to cli/js/ops/, part 1 (#4264)

Following JS ops were moved to separate files in cli/js/ops directory:
- compiler
- dispatch_json
- dispatch_minimal
- errors
- fetch
- fs_events
- os
- random
- repl
- resources
- runtime_compiler
- runtime
- tty

std/examples/gist.ts

@@ -26,8 +26,8 @@ if (parsedArgs._.length === 0) {
 
 const files: Record<string, { content: string }> = {};
 for (const filename of parsedArgs._) {
-  const base = pathBase(filename);
-  const content = await Deno.readFile(filename);
+  const base = pathBase(filename as string);
+  const content = await Deno.readFile(filename as string);
   const contentStr = new TextDecoder().decode(content);
   files[base] = { content: contentStr };
 }