Add tab-prediction-next-action extension

[adnanwahab]

Hi, this is an extension to suggest next-action-prediction by implementing a llamma 3.2 based speculative-edits function.

Key features

• Low Latency - update model every 10 ms using torch
• Privacy - runs only on your machine by default - but can easily use cloud GPus for 10ms round trip time
• https://github.com/pytorch/executorch

Working on documentaiton all weekend, should be ready by Sat Oct 12 8am.

[notpeter]

I manually verified that @adnanwahab has signed the CLA.
cla-bot has been having a bot time of it lately.

[notpeter]

Unclosed " in the last line of your repo's extension.toml:

features = "codebase indexing, llama-integration, gpui extensions