HIVE-27370: support 4 bytes characters

[ryukobayashi]

What changes were proposed in this pull request?

If a SUBSTR UDF has a 4-byte characters in its parameter, the behavior is different between vectorized and non-vectorized. The vectorized version handles 4-byte characters properly, but the non-vectorized version does not, so similar logic is needed.
And these fixes use vectorized logic:
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/StringSubstrColStartLen.java#L89-L130
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/vector/expressions/StringSubstrColStart.java#L78-L109

Previous PR: #5624

Why are the changes needed?

Vectorized and non-vectorized have different results.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

Added pattern tests to itest for these to work correctly.

[ryukobayashi]

@okumin, Last time, I didn't have time to work on it, so this PR(#5624) was automatically closed. So I created another one. The previous PR required extensive testing, but we have already verified it through our internal simulations and found no issues.