include directory tree context provider to inject directory information to prompt, so it can answer questions like: which file is implementing the embedding model inferences?

[umialpha]

@wsxiaoys , i am interested in this issue, but have no idea how to start. Could u share more informations either about rough ideas or any related learning materials. I have some questions.

1. do we need include tree context for every question? If not, when to decide to include.
2. Other than tree context, what else context should be included together?

[umialpha]

@wsxiaoys , i've read answer relevant code. IIUC, tabby wraps relevant code, doc to construct prompt request to llmasever. If so, do you mean we wrap new contexts named tree structure to construct prompt?