filterx: use "type" as a description to FilterXExpr type #444
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I extracted this patch from #423 so that we can build changes that build on this specific patch and can be merged independently of #423.
The point of this patch is to add a new "type" member into FilterXExpr, a string that can be used in various log messages.
I used this to initialize metrics in #423 but I might need it for identifying expr types instead of the "eval" function pointer in #433. Other than that I have a few other patches that change the expr constructors and simply started depending on this change as a part of their diff context.