Improve efficiency of lambda execution

[lyleschemmerling]

Improve efficiency of lambda execution

Description

While doing some research in the implementation of the Graal JS execution engine I think that we can do things more efficiently and gain some performance. We currently build up a new org.graalvm.polyglot.Context for each invocation of the lambda that we run. I think that if we can cache this context and reuse it should save us a lot of the time spent in building that up. However, I don't believe it to be threadsafe so we will need to take that into account when implementing this.

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