Consistent strategy for connection cloning

[hadley]

If length(dbListResults(con)) > 0, functions:

• clone silently (e.g. sqliteTableFields)
• throws an error (e.g. sqliteTransactionStatement)
• do nothing (the majority)

We need a clearly articulated strategy to adhere to.

[hadley]

Connection cloning is dangerous because cloning an in-memory on temporary on disk file creates a new temporary database, not what the user will expect!

[github-actions]

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