doc: first draft of PG 19 release notes

Bruce Momjian <bruce@momjian.us>

Commit: 972c14fb9134fdfd76ea6ebcf98a55a945bbc988
Author: Bruce Momjian <bruce@momjian.us>
Date: 2026-04-15T01:06:27Z
doc:  first draft of PG 19 release notes

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doc/src/sgml/release-19.sgml modified +3380 −4