feat(NewEvaluators): context precision and faithfulness

[akshaylive]

Initial implementation of context precision and faithfulness evaluators.

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==2.4.7.dev1010703663",

  # Any version from PR
  "uipath>=2.4.7.dev1010700000,<2.4.7.dev1010710000"
]

[[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>=2.4.7.dev1010700000,<2.4.7.dev1010710000",
]

[akshaylive]

Note: these evaluators seem to yield higher scores compared to production. We will debug in a follow-up PR.