Switch to uv - converters/omni

[MonkeyCanCode]

As per ML, we want to proceed with more standard layout for python project by using uv. Here are the changes made in this PR:

1. Added LICENSE and NOTICE (see above for reference)
2. Updated pyproject.toml with PEP 639
3. Added authors, readme, keywords, project.urls in pyproject.toml (unlike keywords in python/, this one has an extra entry for Omni)
4. Removed redundant classifiers in pyproject.toml as that is covered by requires-python
5. Added uv.lock
6. Removed pythonpath = ["src"] as that is default path
7. Changed minimal supported python from 3.9 (EOL) to 3.10

Sample validation:

➜  omni git:(switch_to_uv_omni) uv sync
Resolved 13 packages in 17ms
      Built osi-omni @ file:///Users/yong/Desktop/GitHome/ossie/converters/omni
Prepared 1 package in 381ms
Uninstalled 1 package in 1ms
Installed 1 package in 1ms
 ~ osi-omni==0.2.0.dev0 (from file:///Users/yong/Desktop/GitHome/ossie/converters/omni)
➜  omni git:(switch_to_uv_omni) uv run pytest
========================================================================== test session starts ===========================================================================
platform darwin -- Python 3.11.13, pytest-9.1.1, pluggy-1.6.0
rootdir: /Users/yong/Desktop/GitHome/ossie/converters/omni
configfile: pyproject.toml
testpaths: tests
plugins: hypothesis-6.156.6
collected 86 items

tests/test_omni_to_osi.py ....................................                                                                                                     [ 41%]
tests/test_osi_to_omni.py ....................................                                                                                                     [ 83%]
tests/test_real_world_layout.py ....                                                                                                                               [ 88%]
tests/test_roundtrip.py .....sss                                                                                                                                   [ 97%]
tests/test_roundtrip_properties.py ..                                                                                                                              [100%]

===================================================================== 83 passed, 3 skipped in 3.42s ======================================================================

[jbonofre]

Can you please remove the LICENSE and NOTICE file for now? The "root" ones are good enough.