[IOT Lab] Suggestion: Use fluent builder pattern for indexing policy for better readability

[deborahc]

The code for tuning the indexing policy may be easier to read if you use the fluent indexing policy builder:

Current code:
// Tune the indexing policy for write-heavy workloads by only including regularly queried paths.
// Be careful when using an opt-in policy as we are below. Excluding all and only including certain paths removes
// Cosmos DB's ability to proactively add new properties to the index.
telemetryContainerDefinition.IndexingPolicy.ExcludedPaths.Clear();
telemetryContainerDefinition.IndexingPolicy.ExcludedPaths.Add(new ExcludedPath { Path = "/*" }); // Exclude all paths.
telemetryContainerDefinition.IndexingPolicy.IncludedPaths.Clear();
telemetryContainerDefinition.IndexingPolicy.IncludedPaths.Add(new IncludedPath { Path = "/vin/?" });
telemetryContainerDefinition.IndexingPolicy.IncludedPaths.Add(new IncludedPath { Path = "/state/?" });
telemetryContainerDefinition.IndexingPolicy.IncludedPaths.Add(new IncludedPath { Path = "/partitionKey/?"

See example: https://gist.github.com/deborahc/57b996e5f1dd82fcc1aacf00621c2459