We want to be able to debounce calls to `startReplication()`

This commit adds the `startReplicationWithDebounce()` method that is
responsible to debounce the call of `startReplication()` by a specific
delay

The debounce delay can be configured using the CozyPouchLink
constructor's `syncDebounceDelayInMs` option

Calling the `startReplication()` will cancel debounced calls and
immediately execute the replication

In previous commit we added the possibility to debounce the
`startReplication()` method and to configure the debounce delay with
`syncDebounceDelayInMs` parameter

This may be problematic as we expect to call this from realtime events
that may, in some rare scenario, occur too often to trigger a single
replication due to the debounce

To prevent this we add the `syncDebounceMaxDelayInMs` parameter that
will ensure that `startReplication()` is called when the max delay is
reached even if realtime events trigger the debounce for too long