Add --wait-db-ms for --exec

[knu]

When running mddb --watch in the background, the database may be in the middle of an update when you execute a query. This can lead to unexpected or incomplete results. The new --wait-db-ms option allows you to wait for the database to settle (i.e., wait until no writes have occurred for the specified duration) before executing the query, ensuring consistent results.

[changeset-bot]

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Latest commit: 3fbedaf

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[knu]

Test is failing. Node 16 may be too old; can we require Node 20 or better?