Rewrite the swap behaviour so that in-flight requests block process swapping until they are completed.
Additionally:
- add tests for parallel requests with proxy.ProxyManager and proxy.Process
- improve Process startup behaviour and simplified the code
- stopping of processes are sent SIGTERM and have 5 seconds to terminate, before they are killed
Refactor code to support starting of multiple back end llama.cpp servers. This functionality is exposed as `profiles` to create a simple configuration format.
Changes:
* refactor proxy tests to get ready for multi-process support
* update proxy/ProxyManager to support multiple processes (#7)
* Add support for Groups in configuration
* improve handling of Model alias configs
* implement multi-model swapping
* improve code clarity for swapModel
* improve docs, rename groups to profiles in config
* Make starting upstream process on-demand (#10)
* Add automatic unload of model after TTL is reached
* add `ttl` configuration parameter to models in seconds, default is 0 (never unload)
