Improve source mapping for .py and .pyi files

[Aryan-SINGH-GIT]

Fixes issue #1850 ,

Solution:
Added a mapping function that extracts a base name from protobuf-generated filenames and matches it to .proto files.
Changes:

• New function: map_python_protobuf_files() in scanpipe/pipes/d2d.py
• Extracts base names from *_pb2.py and *_pb3.py via regex
• Builds an index of .proto files by base name
• Creates CodebaseRelation with map_type="protobuf_mapping"
• integrated into: map_python step in DeployToDevelop pipeline
• Configuration update: Extended Python ecosystem in d2d_config.py to include .py and .pyi as matchable extensions

Tests: Added unit tests covering extraction, mapping, and edge cases
Testing:

• Unit tests pass
• Tested manually with the test data (6 mappings created)

Signed-off-by: Aryan Singh [email protected]