In 7b4cf1901 deprecated `io.debezium.embedded.spi.OffsetCommitPolicy`,
which provided also constructor for `Configuration`, was removed.
This constructor was actually used for creating `OffsetCommitPolicy`.
`Configuration` provides default values for options which are not
explicitly set, while `Properties` based constructor cannot do that
and therefore with this switch the default value for
`offset.flush.interval.ms` is now missing.
As debezium-api package has no knowledge about `Configuration`
interface, which is part of debezium-core, and thus about the default
values, specify default value direcly in the `PeriodicCommitOffsetPolicy`
class.
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