feat: add sonar properties file

Author: ajaskolski

sonar-project.properties

@@ -0,0 +1,13 @@
+sonar.projectKey=smartcontractkit_cld_changesets
+sonar.projectName=cld_changesets
+sonar.sources=.
+sonar.sourceEncoding=UTF-8
+
+# Solana test helpers (pkg/family/solana/testutils) — not production changeset code
+sonar.exclusions=**/testutils/**/*
+
+# Do not require coverage for tests or shared test utilities
+sonar.coverage.exclusions=**/*_test.go,**/testutils/**/*
+
+sonar.tests=.
+sonar.test.inclusions=**/*_test.go