[ADP-2565] Implement updateWhere

[HeinrichApfelmus]

This pull request

• Implements a function updateWhere that works with the Table type.

Comments

• The collection of functions selectWhere, insertMany, updateWhere, and deleteWhere are sufficient to express all database table manipulations of interest, I don't expect to add more functions to Database.Table.SQLite.Simple.Exec.
• I have skipped extensive property testing for now, as I want to stabilize the API first. The module Demo.Database provides a basic functionality check.

Issue Number

ADP-2565

[Anviking]

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