Avoid duplicate kdoc for constructor parameters

When adding kdoc to constructor parameters, we get duplicate entries. The doc is written to the @param section ond to the property declaration:

/**
 * This is the data class documentation.
 *
 * @param x the x parameter
 * @param y the y parameter
 */
public data class Foo(
  /**
   * the x parameter
   */
  public val x: Int,
  /**
   * the y parameter
   */
  private val y: Long,
)

Goal: only keep the @param docs. Optional: make configurable via properties or pass to processor

Locate the code that generates KDoc for constructor parameters and inspect how @param entries and property declarations are both documented. The issue is done when duplicate entries are removed and the @param documentation is retained; an optional configuration property or processor argument is a separate extension.