Improve performance of `startsWith` and `endsWith` expressions

What is the problem the feature request solves?

CometStringExpressionBenchmark shows poor performance for startsWith and endsWith:

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
startsWith:                               Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                10             77          26          0.1        9567.7       1.0X
Comet (Scan)                                         10             73          31          0.1        9481.0       1.0X
Comet (Scan + Exec)                                  45             80          12          0.0       44128.0       0.2X

OpenJDK 64-Bit Server VM 11.0.22+7-LTS on Mac OS X 14.6.1
Apple M3 Max
endsWith:                                 Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
------------------------------------------------------------------------------------------------------------------------
Spark                                                 9             50          42          0.1        8817.6       1.0X
Comet (Scan)                                         12             85          24          0.1       11731.4       0.8X
Comet (Scan + Exec)                                  15             76          32          0.1       14880.7       0.6X

Describe the potential solution

No response

Additional context

No response