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- return descriptive error messages when unauthorized to create blob or push a model
- display the local public key associated with the request that was denied

Co-authored-by: Michael Yang <mxyng@pm.me>

This fixes issues with blob file names that contain ':' characters to be rejected by file systems that do not support them.

default client already handles proxy

if create overrides a manifest, first add the older manifest's layers to
the delete map so they can be cleaned up

A few obvious levels were adjusted, but generally everything mapped to "info" level.

this fixes a subtle bug with makeRequestWithRetry where an HTTP status
error on a retried request will potentially not return the right err

- remove ggml runner
- automatically pull gguf models when ggml detected
- tell users to update to gguf in the case automatic pull fails
Co-Authored-By: Jeffrey Morgan <jmorganca@gmail.com>