use cbuilder for seq type generation (#24202)

`addSimpleStruct` is just so the compiler doesn't use so much extra
computation on analyzing the `typ` parameter for `addStruct`, which
doesn't change anything for `seq` types. We could probably still get
away with using `addStruct` instead, or making `addStruct` accept `nil`
as the `typ` argument but this would be even more computation.

There were a lot of hidden issues with `addStruct` being a template &
template argument substitution, so most of the behavior is moved into
`startStruct`/`finishStruct` procs.

This is turning out to be a lot of code for just a couple of changed
lines, we might have to split `cbuilder` into multiple modules.

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