[crac] RFR: API for restore time [v2]

[Anton Kozlov]

On Thu, 15 Sep 2022 09:22:43 GMT, Sergey Nazarkin <snazarki at openjdk.org> wrote:

>> Anton Kozlov has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Guarantee len
>
> Marked as reviewed by snazarki (no project role).

@snazarkin thanks for the review!

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PR: https://git.openjdk.org/crac/pull/29