improve: optimize flow timeout's logic

[SkuldNorniern]

Regarding the flow timeout logic, it may take over 5 minutes to execute when paired with a very slow plugin, causing a critical blockage for real-time monitoring. Therefore, while addressing the primary issue of the plugin not being executed on a separate thread, it is also essential to optimize the overall data structure. Currently, the flow uses HashMap and Vector, which need to be replaced with more suitable alternatives.

• fix the plugin code to be executed in a separated thread
• improve data structure of the flow part

[SkuldNorniern]

@WieeRd

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[WieeRd]

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