fix(fs): return Generator from walkSync and expandGlobSync

walkSync and expandGlobSync are generator functions, so at runtime
they already have iterator helpers (map, filter, take, drop, toArray,
...). Their declared return type IterableIterator<WalkEntry> hides
those helpers from TypeScript, forcing callers to wrap with
Array.from() or write a manual loop just to use them.

Narrow the return type to Generator<WalkEntry>. Generator extends
IterableIterator so existing callers stay assignment-compatible, but
the helpers become visible:

  walkSync(".").map((e) => e.name).toArray()  // now type-checks

Async versions (walk, expandGlob) keep AsyncIterableIterator because
the async iterator helpers aren't in the TypeScript lib that Deno
currently ships, so claiming them would mislead callers.

Fixes #7099

Author: LeSingh1

fs/expand_glob.ts

@@ -428,7 +428,7 @@ export async function* expandGlob(
 export function* expandGlobSync(
   glob: string | URL,
   options?: ExpandGlobOptions,
-): IterableIterator<WalkEntry> {
+): Generator<WalkEntry> {
   let {
     root,
     exclude = [],
@@ -473,7 +473,7 @@ export function* expandGlobSync(
   function* advanceMatch(
     walkInfo: WalkEntry,
     globSegment: string,
-  ): IterableIterator<WalkEntry> {
+  ): Generator<WalkEntry> {
     if (!walkInfo.isDirectory) {
       return;
     } else if (globSegment === "..") {

fs/walk.ts

@@ -878,7 +878,7 @@ export async function* walk(
 export function* walkSync(
   root: string | URL,
   options?: WalkOptions,
-): IterableIterator<WalkEntry> {
+): Generator<WalkEntry> {
   let {
     maxDepth = Infinity,
     includeFiles = true,