Improve documentation about query idempotence

Description

In Java driver 3, we had much more information about query idempotence compared to driver 4. For example, in driver 4 docs, there is no information about LWTs, and other things, like it was here: https://docs.datastax.com/en/developer/java-driver/3.9/manual/idempotence/

it would be really useful to add this information back

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Alexey Ott

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