Add gitlens extension

Co-authored-by: neon_arch <mustafadhuleb53@gmail.com>

.gitpod.yml

@@ -31,7 +31,7 @@ vscode:
     - belfz.search-crates-io
     - hbenl.test-adapter-converter
     - hbenl.vscode-test-explorer
-
+    - eamodio.gitlens
 github: 
    prebuilds: 
       master: true