feat: add list assets to service and cli

[radugheo]

This PR introduces the methods list() and list_async() to AssetsService and the CLI command uipath assets.

Development Package

• Use uipath pack --nolock to get the latest dev build from this PR (requires version range).
• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath==2.5.11.dev1011504015",

  # Any version from PR
  "uipath>=2.5.11.dev1011500000,<2.5.11.dev1011510000"
]

[[tool.uv.index]]
name = "testpypi"
url = "https://test.pypi.org/simple/"
publish-url = "https://test.pypi.org/legacy/"
explicit = true

[tool.uv.sources]
uipath = { index = "testpypi" }

[tool.uv]
override-dependencies = [
    "uipath>=2.5.11.dev1011500000,<2.5.11.dev1011510000",
]