pg_plan_filter 1.0.0 released

[pg_plan_filter](https://github.com/pgexperts/pg_plan_filter) version 1.0.0 has been released.

This loadable module test sstatements against specific configured criteria
before execution, raising an error if the criteria are violated. This
allows administrators to prevent execution of certain queries on
production databases.

The criteria are based on the planner's estimated cost. `pg_plan_filter` can
refuse an individual statement whose plan is too expensive
(`statement_cost_limit`), cap the combined cost of all the statements run in
one transaction (`transaction_cost_limit`), and optionally apply the filter to
`SELECT` statements only (`filter_select_only`). The module could be extended
to support further kinds of filters.

It supports PostgreSQL versions 14 through 18.