[enhancement]: give String Generator a "trim whitespace" toggle

[keturn]

Is there an existing issue for this?

• I have searched the existing issues

What should this feature add?

String Generator's Parse String mode should have a toggle that trims leading and trailing whitespace, so I can include whitespace after the delimiter for readability without getting it in the output.

Alternatives

An existing workaround is to put the whitespace in the delimiter itself, e.g. ;\n, but that's more tedious and less flexible.