Initial QSfera import

Server/vendor/github.com/opensearch-project/opensearch-go/v4/.codecov.yml

@@ -0,0 +1,15 @@
+# https://docs.codecov.com/docs/pull-request-comments
+comment:
+  layout: "diff, flags, files"
+  behavior: default
+  require_changes: false  # if true: only post the comment if coverage changes
+  require_base: false        # [true :: must have a base report to post]
+  require_head: true       # [true :: must have a head report to post]
+  hide_project_coverage: false # [true :: only show coverage on the git diff]
+
+coverage:
+  status:
+    project:
+      default:
+        threshold: 5%  # allow 5% coverage decrease
+    patch: off