feat(indexer): Introduce locking mechanism to indexer optimistic indexing

[tomxey]

Description of change

Introduce locking mechanism to indexer optimistic indexing

Links to any relevant issues

fixes #6320

How the change has been tested

Describe the tests that you ran to verify your changes.

Make sure to provide instructions for the maintainer as well as any relevant configurations.

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)

Infrastructure QA (only required for crates that are maintained by @iotaledger/infrastructure)

• Synchronization of the indexer from genesis for a network including migration objects.
• Restart of indexer synchronization locally without resetting the database.
• Restart of indexer synchronization on a production-like database.
• Deployment of services using Docker.
• Verification of API backward compatibility.

Release Notes

• Protocol:
• Nodes (Validators and Full nodes):
• Indexer:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:
• REST API:

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