To address the slow initial query performance, it would be nice to have a warmup public method in CosmosContainer class before running the main query processors

**Describe the bug**
First query always shows very slow performance compared to subsequent queries.

**To Reproduce**
Set up Cosmos DB (sql core) with a container.
Populate 400 radom document data into the container.
Create a command line app with a query to pull top 300 records . Have multiple iteration with for loop to run this command inside the app.
Observe the first query is very slow to compare to subsequent query.

**Expected behavior**
There should be no noticeable performance between the first and subsequent same queries.

**Actual behavior**
Once the first query run with a long wait, the subsequent query does not show this slow performance.

**Environment summary**
SDK Version: V4 preview.1
Java JDK version: "1.8.0_222"
OS Version (e.g. Windows, Linux, MacOSX): Linux Ubuntu 18.04

**Additional context**
Add any other context about the problem here.