Prohibit Usage of isNullOrEmpty and isEmpty for null handling

[nishantmonu51]

It seems to me that usage of com.google.guava.common.base.Strings.isNullOrEmpty(), java.lang.String.isEmpty(), etc. should be prohibited too in favor of NullHanlding.isNullOrEquivalent() and StringUtils.isNullOrEmptyNonDruidDataString() (should create such method)

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