When an error occurs in `TrySeq`, log the error.
Also, in the trace statements, capture the file/line that the sequence was constructed at, and log that with the traces.
Closes#35319
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35319 from ctiller:trace-seq bc0d47395f
PiperOrigin-RevId: 591999228
Our current implementation of `Seq`, `TrySeq` leverage some complicated
template stuff to work, which makes them hard to maintain. I've been
thinking about ways to simplify that for some time and had something
like this in mind - using a code generator that's at least a little more
understandable to code generate most of the complexity into a file that
is checkable.
Concurrently - I have a cool optimization in mind - but it requires that
we can move promises after polling, which is a contract change. I'm
going to work through the set of primitives we have in the coming weeks
and change that contract to enable the optimization.
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Co-authored-by: ctiller <ctiller@users.noreply.github.com>
Craig Tiller