feat: add codecov config

codecov.yml

@@ -0,0 +1,27 @@
+codecov:
+  require_ci_to_pass: true
+
+coverage:
+  precision: 2
+  round: down
+  range: "30...100"
+
+  status:
+    project:
+      default:
+        informational: true # do not fail check
+        only_pulls: true
+    patch: false
+
+parsers:
+  gcov:
+    branch_detection:
+      conditional: yes
+      loop: yes
+      method: no
+      macro: no
+
+comment:
+  layout: "reach,diff,flags,files,footer"
+  behavior: default
+  require_changes: false