Support uv package manager

[falkaer]

Proposal Summary

It would be nice to have the option of using uv to manage dependencies instead of pip/conda/poetry.

The simplest support would be to just use uv pip as a drop-in replacement for pip when installing from a task's requirements in the clearml agent.

Motivation

Much faster environment build times on slow file systems.

On my university cluster all storage on most GPU nodes is network-attached with high throughput but very slow random access, and building my environment using pip hits a massive performance cliff and can easily take over an hour to complete even with all downloads already cached, compared to uv which can do this in about a minute.

I've resorted to handrolling my own clearml agent replacement for now because environment building takes so long with pip (and environments are rebuilt from scratch with every change)

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