Feature Request: Next Edit Support

[wsxiaoys]

Is your feature request related to a problem? Please describe.
Support Next Edit Suggestion

This feature was previously explored in this pull request and should be continued here in with a focus on the code completion aspect.

Describe alternatives you've considered
The current alternative is for the user to manually move the cursor and trigger a new completion, which is less efficient.

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Tasks:

• Edit History Context Provider: Provide context from the user's edit history.
• Chat API Client: A client to interact with the chat API, including building prompts, parsing responses, and post-processing.
• NES Trigger Logic: The logic that determines when to trigger the NES.

[icycodes]

Working on "Provide context from the user's edit history."

[icycodes]

The next edit suggestion basic functions are implemented.
The UI still needs improvement(#402), working on this.