Ability to retry a data provider during failures

[krmahadevan]

Closes #2819

Fixes #2819 .

Did you remember to?

• Add test case(s)
• Update CHANGES.txt
• Auto applied styling via ./gradlew autostyleApply

Sample test case

import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;

public class TestClassUsingDataProviderRetrySample {

  private int counter = 0;

  @Test(dataProvider = "dp")
  public void sampleTest(int ignored) {}

  @DataProvider(name = "dp", retryUsing = SimpleRetry.class)
  public Object[][] getTestData() {
    if (counter++ < 2) {
      throw new RuntimeException("Simulating a failure");
    }
    return new Object[][] {{1}};
  }
}

Sample retry mechanism implementation

import org.testng.IDataProviderMethod;
import org.testng.IRetryDataProvider;

public class SimpleRetry implements IRetryDataProvider {

  private int counter = 0;

  @Override
  public boolean retry(IDataProviderMethod dataProvider) {
    return counter++ < 2;
  }
}