Java: Data Flow Tracking for Stream/Promise based data flow

[JLLeitschuh]

Description of the issue

Data flow tracking doesn't currently work when the flow source uses non-procedural based data flow and instead uses stream or asynchronous paradigms.

A few examples:

• Java 8 Streams APIs
• Java 8 CompletableFuture
• RX Java
• Third party library implementations of Proimise
  • Ratpack Promise

Javascript has support for this library.
https://github.com/github/codeql/blob/main/javascript/ql/src/semmle/javascript/Promises.qll

Having a similar generic & extendable API would be appreciated.

[github-actions]

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