feat: Add boundary_role data source (#743)

examples/data-sources/boundary_role/data-source.tf

@@ -0,0 +1,15 @@
+# Role from the global scope
+data "boundary_role" "global_role" {
+  name = "global_role_one"
+}
+
+# Role from an org scope
+data "boundary_scope" "org" {
+  name     = "org_one"
+  scope_id = "global"
+}
+
+data "boundary_role" "org_role" {
+  name     = "org_role_one"
+  scope_id = data.boundary_scope.org.id
+}