Improvement: Runtime implementation for Rust Method APIs

### What

Rust Method APIs design https://github.com/eclipse-score/communication/pull/777/ created, as per designed interface trait implement `LoLa-Runtime` same as Event backend implementation also implement the FFI APIs as well.

### How

- Implement the LoLa Runtime backend following the designed interface traits.
- Ensure the implementation is aligned with the existing Event backend implementation pattern and behavior.
- Implement the required FFI APIs for the Rust Method APIs to enable interoperability with external runtime components.

### Estimates for realization

0

### Category

- [ ] Affects Detailed Design

### Requirements / Architecture

- [ ] Requirements / Architecture are not affected by this change?

Read the Rust Method APIs design in pull request 777 and compare it with the existing Event backend implementation. Identify the interface traits and required FFI APIs for the LoLa runtime, then verify that the runtime follows the established behavior and supports interoperability with external runtime components.

Written by the indexing model from the issue text.