IGNITE-27033: checkpoint control.sh command

[DEADripER]

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[nizhikov]

@DEADripER please, fix code style violations.

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[nizhikov]

Overall looks good. @DEADripER I wonder, do we support the case when one server node are in-memory and other has pds enabled.

Seems we must just return node status for all cases and print it out like that:

    private static class CheckpointJob extends VisorJob<CheckpointCommandArg, Void> {
...
        @Override protected Void run(CheckpointCommandArg arg) throws IgniteException {
            if (!CU.isPersistenceEnabled(ignite.configuration()))
                return ignite.localNode().id() + ": PDS disabled";
           // checkpoint relate code.
           ....
           if (arg.waitForFinish()) {
               ....
               return ignite.localNode().id() + ": Checkpoint strarted";      
           }
           
           return ignite.localNode().id() + ": Checkpoint finished";
        }

Task must collect node results and return it to the command.