feat: add LTI 1.3 Tool Consumer support with database migrations and API endpoints

- Implemented database migrations for lti_external_tools and lti_grade_passback_events tables in both cms-service and lms-service.
- Created API handlers for managing LTI tools including listing, creating, updating, and deleting tools.
- Added functionality for LTI grade passback with validation and signature verification.
- Developed frontend components for LTI tool management and display in course editor.

Co-authored-by: Copilot <copilot@github.com>

services/lms-service/Cargo.toml

@@ -30,5 +30,7 @@ mime_guess = "2.0"
 aws-config = "1"
 aws-sdk-s3 = "1"
 sha2.workspace = true
+hmac.workspace = true
+hex.workspace = true
 lettre = { version = "0.11", default-features = false, features = ["builder", "smtp-transport", "tokio1", "tokio1-native-tls"] }
 rand = "0.8"