Fix LIKE expressions for CHAR

[tdcmeehan]

Description

Currently, SqlToRowExpressionTranslator will attempt to optimize queries that contain like that begin and end with % as follows:

select x like '%abc' from char_col

as

select cardinality(split(...charcol...)) 

This doesn't work because split is only registered for VARCHAR, not CHAR.

Motivation and Context

Any query that attempts to do LIKE '%text%' over a char column is broken.

Impact

Restore functionality and backport into 0.284, 0.285 and prepare for 0.286.

Test Plan

Attached unit tests.

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Release Notes

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== RELEASE NOTES ==

General Changes
* Fix queries that filter with LIKE '%...%' over char columns

[kaikalur]

Can we add a task to add SPLIT for CHAR type as well?

[kaikalur]

LGTM