Store if a prompt tree element is included in the final renderer result

[hediet]

The prompt renderer materializes the prompt tree and computes the messages from it under consideration of the max prompt size and the prompt tree prioritization. For visualization purposes, it would be nice if the prompt tree elements would indicate if they are included in the final result or skipped. Otherwise, it is difficult to indicate in the tree visualization if a node made it after prioritization or not.

vscode-prompt-tsx/src/base/promptRenderer.ts

Line 238 in b9b5bb4

public async render(progress?: Progress<ChatResponsePart>, token?: CancellationToken): Promise<RenderPromptResult> {

Are you up for a PR on this?