feat: share models by url

[mudler]

Description

This PR allows to start local-ai with a list of model config files URLs or our short-handed format (e.g. huggingface://. github://). It works by passing the urls as arguments or environment variable, for example:

local-ai github://owner/repo/file.yaml@branch

# Env
MODELS="github://owner/repo/file.yaml@branch,github://owner/repo/file.yaml@branch" local-ai

# Args
local-ai --models github://owner/repo/file.yaml@branch --models github://owner/repo/file.yaml@branch

For example, to start localai with phi-2, now it's possible for instance (config file from gists):

./local-ai https://gist.githubusercontent.com/mudler/ad601a0488b497b69ec549150d9edd18/raw/a8a8869ef1bb7e3830bf5c0bae29a0cce991ff8d/phi-2.yaml

The file should be a valid YAML configuration file. Note this works well with the last feature #1452. Note this is different from model galleries as that supports up to now also downloading multiple assets. This is for now an attempt to ease out the ux (see also #1373)

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[mudler]

to some extents this PR enhanced messages of model loading (see #1416)