Adds experimental support for uv.lock in ImageSpec

[thomasjpfan]

Why are the changes needed?

uv and uv.lock is becoming a commonly used tool for managing python environments. This PR adds experimental support for uv.lock into ImageSpec.

What changes were proposed in this pull request?

This PR enables requirements="uv.lock" support in ImageSpec. Using uv.lock shows a warning stating that uv.lock support is experimental since uv sync is experimental, so our integration may change.

How was this patch tested?

mkdir uv-check
cd uv-check
uv init
uv add flytekit numpy

# activate python environment with this PR
pyflyte run --remote main.py my_task

where main.py is:

from flytekit import task, ImageSpec

image_spec = ImageSpec(
    name="uv-wow",
    requirements="uv.lock",
    registry="localhost:30000",
    env={"abc": "xyz125"},
)


@task(container_image=image_spec)
def my_task() -> int:
    import numpy as np

    return np.asarray([1, 2, 3]).sum().item()

[eapolinario]

I wish we had a better way to signal that uv lock files could be used in imagespec that didn't involve overloading the requirements parameter. Can't think of anything better though, so let's get this out.

[eapolinario]

nit: should this mention that support for uv.lock files and packages is mutually exclusive instead?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.36%. Comparing base (8feb3b8) to head (c630885).
Report is 8 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2929       +/-   ##
===========================================
- Coverage   94.25%   79.36%   -14.90%     
===========================================
  Files          18      199      +181     
  Lines        1358    20910    +19552     
  Branches        0     2691     +2691     
===========================================
+ Hits         1280    16595    +15315     
- Misses         78     3574     +3496     
- Partials        0      741      +741     

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