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Combining different CEL expressions into a single expression #593

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@josephschorr We've shied away from merging pre-compiled expressions since this tends to be error prone. I would recommend using the cel.AstToString method to convert your CheckedExpr values to human-readable strings that you stitch together with &&, ||, and ! before recompiling the combined expression. The only drawback of this approach is that it requires you to have setup the cel.NewEnv() in a way that makes it possible to stitch these expressions together and compile them again.

Your other alternative is to create aliases for the compiled expressions, e.g. lazyExprs map[string]cel.Ast and implement the interpreter.Activation in a way that when the name of the lazy expression is provid…

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