HDDS-6509. Checkstyle: Enable setterCanReturnItsClass in HiddenField

[kaijchen]

What changes were proposed in this pull request?

Enable setterCanReturnItsClass in checkstyle HiddenField so it will not yield 'fieldName' hides a field error in Builders.

For example:

public Builder setVolumeName(String volumeName) { // not allowed before
  this.volumeName = volumeName;
  return this;
} 

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-6509

How was this patch tested?

Checkstyle

[kaijchen]

CC @adoroszlai for review.

[adoroszlai]

Thanks @kaijchen for the patch, this is useful.

Checkstyle doc for reference:
https://checkstyle.sourceforge.io/config_coding.html#HiddenField

[kaijchen]

Thanks for review and adding the doc @adoroszlai.