chore: Clean up the metadata files (#622)

Signed-off-by: sheche <sheche@microsoft.com>

Co-authored-by: Shi Chen <122255951@qq.com>

Author: jdneo

.gitignore

@@ -11,5 +11,8 @@ vscode-java-*.vsix
 packages/
 dist
 **/.settings
+**/.classpath
+**/.project
 **/.checkstyle
 test-resources/
+**/.gradle