Sort .gitignore and add .venv (#8777)

* Sort .gitignore and add .venv

* Update .gitignore

Author: shoumikhin

.gitignore

@@ -1,41 +1,32 @@
+# System files
+.DS_Store
+
+# Python environment and cache
 .hypothesis
-buck-out/
 .mypy_cache/
+.venv/
+__pycache__/
+
+# Build and tool-generated files
+buck-out/
 buck2-bin/
-cmake-out*
-.DS_Store
 cmake-android-out/
-cmake-out-android/
 cmake-ios-out/
+cmake-out*
+cmake-out-android/
 ethos-u-scratch/
 executorch.egg-info
 pip-out/
-__pycache__/
 
 # Any exported models and profiling outputs
-*.pte
-*.model
-!test_tiktoken_tokenizer.model
 *.bin
+*.model
+*.pte
 !test_bpe_tokenizer.bin
+!test_tiktoken_tokenizer.model
 
 # Editor temporaries
-*.swa
-*.swb
-*.swc
-*.swd
-*.swe
-*.swf
-*.swg
-*.swh
-*.swi
-*.swj
-*.swk
-*.swl
-*.swm
-*.swn
-*.swo
-*.swp
+*.idea
+*.sw[a-z]
 *~
 .~lock.*
-*.idea