Update InListOps.kt

[GeorgCantor]

Description

Summary of the change: These changes improve both performance and readability while maintaining the original functionality of the code.

Detailed description:

Single Check for Iterator: We store the result of iterator.hasNext() in hasElements to avoid multiple calls.

Streamlined Column Type Handling: We use columnTypes.size instead of singleOrNull() for clarity and efficiency.

Helper Function for Operator Appending: The appendOperator function reduces redundancy in appending SQL operators based on whether it's an IN or NOT IN operation.

Concise Empty List Handling: The handling of an empty list is more straightforward, directly returning after appending the appropriate boolean value.

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Type of Change

Please mark the relevant options with an "X":

• Bug fix
• New feature
• Documentation update

Updates/remove existing public API methods:

• Is breaking change

Affected databases:

• MariaDB
• Mysql5
• Mysql8
• Oracle
• Postgres
• SqlServer
• H2
• SQLite

Checklist

• Unit tests are in place
• The build is green (including the Detekt check)
• All public methods affected by my PR has up to date API docs
• Documentation for my change is up to date

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