[ADD] - reverse function

[zmrdltl]

Uploaded function reverse
To operate : Only a table exists and only string type should be received as a parameter.

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (main@3019bef). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #327   +/-   ##
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  Coverage        ?   90.95%           
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  Files           ?      126           
  Lines           ?     7714           
  Branches        ?        0           
=======================================
  Hits            ?     7016           
  Misses          ?      698           
  Partials        ?        0           

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[panarch]

I was looking forward to use this code coverage test in the PR review, now it is available :)
Thanks to @MRGRAVITY817 🥇

Looks very good 👍 Only a single request here, adding a NULL value test.

ref https://codecov.io/gh/gluesql/gluesql/src/1325672384517576577cebd86ea3b6057c4ad914/src/executor/evaluate/mod.rs

You can also get help from this code coverage report.
There is lack of test of REVERSE function taking NULL value as a param.

[zmrdltl]

Added what you requested. plus, error about param which is int. Is that ok?

[panarch]

Awesome 👍 👍 👍
Merging!

[panarch]

close #265