Improve performance of `reverse` expression

What is the problem the feature request solves?

CometStringExpressionBenchmark shows poor performance:

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
reverse:                                  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                 9             38          32          0.1        9123.9       1.0X
Comet (Scan)                                         10             67          37          0.1        9927.6       0.9X
Comet (Scan + Exec)                                  48             86          13          0.0       46943.3       0.2X

Describe the potential solution

Review benchmark to make sure it is valid, then try and optimize.

Additional context

No response