chore: update .gitignore for local and env files

- Add /tmp*, /.bin*, and /.patches/ to ignore local files
- Add .dmypy.json to ignore mypy cache
- Add /tags to ignore Exuberant Ctags tag file
- Add /.source* to ignore environment variable files

Author: mkoura

.gitignore

@@ -1,5 +1,7 @@
-# Local temporary files
-tmp/
+# Local files
+/tmp*/
+/.bin*/
+/.patches/
 
 # Byte-compiled / optimized / DLL files
 __pycache__/
@@ -8,6 +10,13 @@ __pycache__/
 
 # mypy
 .mypy_cache/
+.dmypy.json
+
+# Exuberant Ctags tag file
+/tags
+
+# Env variables
+/.source*
 
 # Distribution / packaging
 .Python