Ziga/og deduplicate events

[zkokelj]

Why this change is needed

After enabling users to subscribe with multiple accounts there are scenarios when users can get duplicated events (one per account instead of one per user). We want to deduplicate them for the users to have similar experience as with Ethereum.

What changes were made as part of this PR

Implementation and usage of circular buffer for deduplication.

Please provide a high level list of the changes made

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