ci: Add configuration for CodeRabbit

We want to disable some features and tell it to ignore some files.

Author: vojtechtrefny

.coderabbit.yaml

@@ -0,0 +1,14 @@
+language: "en-US"
+early_access: false
+reviews:
+  profile: "chill"
+  poem: false
+  in_progress_fortune: false
+  sequence_diagrams: false
+  related_issues: false
+  related_prs: false
+  suggested_labels: false
+  suggested_reviewers: false
+  path_filters: ["!plans/**", "!.github/**", "!.fmf/**"]
+chat:
+  art: false