transform: add keyset pagination and streaming emit path HEAD master

* transform/special-forms.scm (define-transformer): Add keyset
arguments and cursor return path; add SQL helpers for keyset
ordering/filtering; avoid po-alist allocation by streaming short
turtle emission.
(with-documentation): Add keyset pagination loop using per-input
cursor state and configurable chunk key field.
(emit-short-turtle): Emit triples in a single linear pass.
* examples/probesets-experiment-metadata.scm: Enable keyset pagination
and set composite chunk key fields for ProbeSetFreeze/ProbeSet join.

Signed-off-by: Munyoki Kilyungi <me@bonfacemunyoki.com>

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