Feature/rmaker init deinit (MEGH-6105)

[Asc91]

Description

1. Create update rmaker_stop and rmaker_end to exit gracefully.
2. Add unit test for esp_rmaker to check for potential memory leaks and avoid breaking changes.
3. Fix memory leaks found using unit test.

Testing

Commits were tested with esp32s3, latest esp-rainmaker, ESP-IDF 5.1 and ESP-IDF master

Related Issues

Closes #279

@vikramdattu @shahpiyushv

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