fix: batches failed to be sent to data plane

[desusai7]

fix: batches failed to be sent from the mobile SDKs

Due to a race condition occurring when events are triggered from another thread while the SDK is getting initialized, the generated event payloads are missing anonymousId, context, & userId.

These events were causing the requests made to the /batch endpoint of the data plane to fail with an error message: Request neither has anonymousId nor userId.

Hence, to fix this issue, we made the RudderClient class thread-safe and added the capability to delete invalid events from the DB when we receive Request neither has anonymousId nor userId from the data plane.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added unit tests for the code
• I have made corresponding changes to the documentation

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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