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Also fixes a few fit-and-finish items for better developer experience

This focuses on Windows first, but coudl be used for Mac
and possibly linux in the future.

Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

* remove c code
* pack llama.cpp
* use request context for llama_cpp
* let llama_cpp decide the number of threads to use
* stop llama runner when app stops
* remove sample count and duration metrics
* use go generate to get libraries
* tmp dir for running llm

Co-authored-by: Jeffrey Morgan <251292+jmorganca@users.noreply.github.com>