[pending-dataset] fix handling of large Delay Timer values (#2158)
[pending-dataset] fix handling of large Delay Timer values (#2158)

The Delay Timer value has a 32-bit range.  However, the current Timer
implementation does not support the full 32-bit range.

This commit fixes the handling of large Delay Timer values by splitting
the delay across multiple timer triggers.

Credit to OSS-Fuzz.
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