feat: mark generated files in git attributes

Author: HashimTheArab

.gitattributes

@@ -1,4 +1,12 @@
 * text=auto
 *.php text eol=lf
 *.ts text eol=lf
-*.go text eol=lf
+*.go text eol=lf
+
+# Generated files from buf/protoc
+proto/generated/** linguist-generated=true
+packages/cpp/src/generated/** linguist-generated=true
+packages/php/src/generated/** linguist-generated=true
+packages/python/src/generated/** linguist-generated=true
+packages/rust/src/generated/** linguist-generated=true
+packages/node/src/generated/** linguist-generated=true