chore(coderabbitai): Codify and improve config

.coderabbit.yaml

@@ -0,0 +1,19 @@
+# yaml-language-server: $schema=https://coderabbit.ai/integrations/schema.v2.json
+reviews:
+  # Make AI main comment collapsed by default, as it took too much space when
+  # expanded. Plus it's not needed during every PR opening, mostly during first
+  # check
+  collapse_walkthrough: true
+  # Move AI-generated summary from PR description to AI main comment. It
+  # hallucinate sometimes, especially in PRs which change linting rules
+  high_level_summary_in_walkthrough: true
+  # Disable false-positive cross links between PRs and issues
+  related_issues: false
+  # Disable false-positive cross links between PRs and issues
+  related_prs: false
+  # Disable useless Poem generation
+  poem: false
+
+  auto_review:
+    # Enable AI review for Draft PRs
+    drafts: true