Prefetch next inline recommendation

[evanliu048]

Types of changes

• New feature (non-breaking change which adds functionality)

Description

This PR introduces the ability for users to see the next recommendation immediately after accepting the current one, provided there is a subsequent recommendation available. The key enhancements include:

1. Automatic Prefetching: Introduced a function that calls the CodeWhisperer API to fetch the next recommendation while the current one is being reviewed.
2. Session Promotion Added functionality to display the next recommendation instantly upon accepting the current recommendation (if there is one)
3. Helper Utilities: Implemented helper functions to calculate the necessary file information for the next request and to send telemetry events related to the subsequent recommendation.

License

I confirm that my contribution is made under the terms of the Apache 2.0 license.