Feature/query pipeline rewrite (#32577)

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### Describe the problem that is addressed by this PR


### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_


### Provide a list of related PRs _(if any)_


### Command used to generate this PR:**_(Applicable only to SDK release
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### Checklists
- [ ] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
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---------

Co-authored-by: Manik Khandelwal <mkhandelwal@microsoft.com>
Co-authored-by: Aman Rao <amanrao@microsoft.com>

sdk/cosmosdb/cosmos/test/internal/unit/documentProducer.spec.ts

@@ -20,7 +20,7 @@ describe("11Test DocumentProducer", function () {
   };
 
   it("fetchBufferedItems should return first item", async function () {
-    let documentProducer = new DocumentProducer(
+    const documentProducer = new DocumentProducer(
       mockedClientContext,
       "mockCollectionLink",
       sqlQuerySpec,
@@ -46,7 +46,7 @@ describe("11Test DocumentProducer", function () {
   });
 
   it("fetchNextItem should return first item", async function () {
-    let documentProducer = new DocumentProducer(
+    const documentProducer = new DocumentProducer(
       mockedClientContext,
       "mockCollectionLink",
       sqlQuerySpec,
@@ -74,7 +74,7 @@ describe("11Test DocumentProducer", function () {
   });
 
   it("peak item should return first item", async function () {
-    let documentProducer = new DocumentProducer(
+    const documentProducer = new DocumentProducer(
       mockedClientContext,
       "mockCollectionLink",
       sqlQuerySpec,