Add toast_tuple_target to Materialized View properties dialog (#9626)

[pavanmanishd]

Closes #9626

Problem

The toast_tuple_target storage parameter (PostgreSQL 11+) is supported by materialized views via ALTER MATERIALIZED VIEW ... SET(TOAST_TUPLE_TARGET = N), but the pgAdmin Materialized View properties dialog has no way to view or change it.

Changes

• properties.sql — extract toast_tuple_target from c.reloptions (same regex pattern as fillfactor)
• create.sql — include TOAST_TUPLE_TARGET in the WITH clause when set; extend the condition that decides whether a WITH block is needed
• update.sql — SET / RESET TOAST_TUPLE_TARGET when the value changes (mirrors the FILLFACTOR block exactly)
• mview.ui.js — integer input field (min 128, max 8160) in the Definition group, min_version: 110000

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[dpage]

Merged to master as c720a33 (squashed, with you as author). Thanks @pavanmanishd!

One adjustment during merge: the original change only touched the mviews/pg/default/ SQL bucket, which serves PostgreSQL < 12 — so it had no effect on any supported server. Supported versions (13–18) resolve to the 13_plus/15_plus buckets (17_plus falls back to 15_plus), which carry their own standalone create/properties/update.sql. The same toast_tuple_target changes are now applied to the 12_plus, 13_plus and 15_plus buckets as well.

Verification: template output is byte-identical to the previous SQL when toast_tuple_target is unset (no change to existing behaviour), and the generated CREATE/ALTER SET/ALTER RESET/recreate forms were confirmed to execute on a live PostgreSQL 18 server with the expected reloptions. A 9.16 release note was added.