fix: add mock template runtime with chat events

[cristipufu]

Description

This PR adds a mock template runtime with support for reading events and entry points schema from JSON files

Development Package

• Add this package as a dependency in your pyproject.toml:

[project]
dependencies = [
  # Exact version:
  "uipath-dev==0.0.12.dev1000280087",

  # Any version from PR
  "uipath-dev>=0.0.12.dev1000280000,<0.0.12.dev1000290000"
]

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

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