Check rule conditions serially instead of in parallel

We're running into issues where our facts are based on transactional access to a database. When we try to properly decompose our rules into multiple facts, we hit problems where the same transaction is trying to be used simultaneously because the rules engine appears to process facts in parallel by default.

I know there's a way to set priority on rules and facts which should make them run serially. The issue with this approach Is that is appears to be declarative on the fact itself and not on the user of the fact when constructing rule conditions. This makes it hard to use when you may want to decompose rule conditions in different order but still have them run serially instead of in parallel.

首先检查规则引擎如何调度规则条件，以及优先级如何应用于规则和事实；issue 未指明任何文件或测试。确定条件消费者如何请求串行求值，并验证分解后的事务事实不再尝试同时使用同一事务。

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