Added support for throughput buckets.

[mkrueger]

This pull request introduces a new feature to support "throughput buckets" in the CosmosDB query editor. The changes include updates across multiple files to enable users to select a throughput bucket when running queries, as well as backend logic to manage and update the state of throughput buckets.

Note: ATM the buckets don't get verified. The API doesn't contain a way to get the information. The portal seems to include calls/functions to retrieve the information but the SDK seems not do to that. I didn't want to duplicate portal code in the extension.

Backend updates for throughput buckets:

• src/cosmosdb/session/QuerySession.ts: Added support for passing the selected throughput bucket to the connection policy when initializing the query session.
• src/cosmosdb/types/queryResult.ts: Extended the ResultViewMetadata type to include a throughputBucket property.

Frontend updates for throughput bucket selection:

• src/panels/QueryEditorTab.ts: Added a method updateThroughputBuckets to fetch and update the throughput bucket options, with placeholder logic for now.
• src/webviews/cosmosdb/QueryEditor/QueryPanel/RunQueryButton.tsx: Updated the query execution logic to include the selected throughput bucket and added UI elements (checkboxes and menu items) for selecting throughput buckets in the query editor. [1] [2]

State management for throughput buckets:

• src/webviews/cosmosdb/QueryEditor/state/QueryEditorContextProvider.tsx: Added event listeners and methods to update the throughput bucket state and handle bucket selection. [1] [2]
• src/webviews/cosmosdb/QueryEditor/state/QueryEditorState.tsx: Extended the state to include throughputBuckets and selectedThroughputBucket, and added actions for selecting and updating throughput buckets. [1] [2] [3] [4]