Separate init/destroy and start/stop steps in LLMQ flow #2709
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Turned out that some changes in #2703 can cause crashes and stale threads because worker thread deals with too many stuff that are outside of
CSigSharesManager
(and which might be deleted by the time it tries to access them). Also,workInterrupt
wasn't handled properly too...But while debugging this issue I realized that we actually mix init/start and destroy/stop steps a lot in LLMQ, so this PR not only fixes issues mentioned above, but also splits the flow for other (existing) LLMQ modules to avoid similar issues in the future.