I01: stateHistoryRetentionPeriod not validated

[alysiahuggins]

Affected Code: LightClient.sol (line 210)

Summary: The property stateHistoryRetentionPeriod is not validated
during initialization, but it requires a minimum of 1 hour when updat-
ing it (on lines 439-445). This inconsistency could result in the period
being initialized to less than 1 hour, leading to an unexpected state.

Suggestion: We suggest to validate whether the property
stateHistoryRetentionPeriod is greater than 1 hour at initialization time.
This would result in removing the revert condition whether
stateHistoryRetentionPeriod is less than 1 hour in
setstateHistoryRetentionPeriod if the value can only be increased.