Add support for uploading collection from path

example for uploading collection from local filesystem
```
files:
- foo_namespace-bar_collection-1.0.0.tar.gz

command:
galaxykit collection upload ./foo_namespace-bar_collection-1.0.0.tar.gz
```

Usage:
When testing more nuanced features, like signatures we may need an exact, non-dummy collection to test on. This command would allow us, to use a collection which is more detailed or on other ways specific than the default generated ones with orionutils.

Start by locating the CLI entry point for `galaxykit collection upload` and trace how it currently obtains a collection. Use the local `./foo_namespace-bar_collection-1.0.0.tar.gz` example to verify that an explicitly supplied path is accepted and uploaded successfully.

Written by the indexing model from the issue text.