[crac] RFR: API for restore time

[Sergey Nazarkin]

On Mon, 12 Sep 2022 19:54:41 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> This PR adds an ability to get restore time, similar to RuntimeMXBean.getUptime() [1] and getStartTime(). Before I used to print timestamps and parse console output, which was not very convenient.
> 
> [1] https://docs.oracle.com/en/java/javase/17/docs/api/java.management/java/lang/management/RuntimeMXBean.html#getUptime()

Marked as reviewed by snazarki (no project role).

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