jsonrpc: Add runaccountmixer method #2437
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This ensures that the context of in-flight RPC requests is cancelled when the dcrwallet process context is cancelled.
Use the server waitgroup to ensure background rescans can return on their own terms rather than being forcefully terminated early. This is still not an ideal situation because in the case where the server/wallet is being shut down, RescanFromHeight will return with an "rpc connection closed" error (or similar) rather than returning because its provided context was cancelled. However, that is a notable improvement over the existing situation which could result in an unhandled panic.
Using the server context instead of context.Background means that the long-lived rescan funcs are able to exit properly when the server is shutdown and its context is closed.
This new method starts an account mixer in the background and returns to the client without blocking. This differs from the gRPC version of runaccountmixer which blocks until the account mixer returns.
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This new method starts an account mixer in the background and returns to the client without blocking. This differs from the gRPC version of runaccountmixer which blocks until the account mixer returns.
Draft until #2434 and #2435 are reviewed/merged and this is rebased.