GitLab

* basic distribution w/ push/pull

* add the parser

* add create, pull, and push

* changes to the parser, FROM line, and fix commands

* mkdirp new manifest directories

* make `blobs` directory if it does not exist

* fix go warnings

* add progressbar for model pulls

* move model struct

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

block on write which only returns when the channel is closed. this is
contrary to the previous arrangement where the handler may return but
the stream hasn't finished writing. it can lead to the client receiving
unexpected responses (since the request has been handled) or worst case
a nil-pointer dereference as the stream tries to flush a nil writer

feed responses back into the llm

- move error check to api client pull
- simplify error check in generate
- return nil on any pull error