feat: Implement lesson attempt tracking, retry functionality, and max attempt limits for interactive blocks.

services/lms-service/migrations/20231222000001_lesson_attempts.sql

@@ -0,0 +1,6 @@
+-- Add attempt limits and retry configuration to lessons
+ALTER TABLE lessons ADD COLUMN max_attempts INTEGER;
+ALTER TABLE lessons ADD COLUMN allow_retry BOOLEAN NOT NULL DEFAULT TRUE;
+
+-- Track attempt count in user_grades
+ALTER TABLE user_grades ADD COLUMN attempts_count INTEGER NOT NULL DEFAULT 1;