[R4R]fix potential deadlock of pub/sub module

[unclezoro]

Description

Fix the potential deadlock of pub/sub module.

More detail in: #58

Rationale

The deadlock dependency is:

Routine A:NewPendingTransactionFilter want to lock filtersMu to consume hashes;
Routine B: eventLoop is waiting Routine A to consume hashes so that it can push new hash to channel.
Routine C: Unsubscribe is holding lock filtersMu, but it is waiting for Routine B to consume uninstall channel.

Example

add an example CLI or API response...

Changes

There is no need to fetch lock on NewPendingTransactionFilter routine, so just loose the logic.

And fix the potential risk that Unsubscribe routine does not drain all the hash, header and log.

Preflight checks

• build passed (make build)
• tests passed (make test)
• manual transaction test passed

Already reviewed by

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