Add 'isFormStyle', 'isSpaceDelimited', and 'isPipeDelimited' flags to CodegenParameter

[Rym-qt]

This PR is related to issue #21239
These newly added flags lay the foundation for future changes in the generator's template files, particularly for the cpp-qt-client.

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[wing328]

These newly added flags lay the foundation for future changes in the generator's template files, particularly for the cpp-qt-client.

thanks for the PR

what about including these changes (cpp-qt templates) in this PR as well?

cc @OpenAPITools/generator-core-team