Remove a param docblock made redundant by the added type

[TomasVotruba]

When a parameter is given a native type and the doc comment already declares that same type in an @param tag, the tag becomes pure duplication:

/**
 * @param string $value   // redundant once the type is added
 */
public function foo(string $value) {}

This removes the redundant @param line for any type - scalars, arrays, and objects (matched with or without a leading backslash) - and drops the whole doc comment when nothing else is left. A tag is kept when it carries a description, or when its type differs from the one added (e.g. @param mixed while the added type is \DateTime).

• new phpast.StripRedundantDocParams, driven by the type text apply writes for each parameter
• a blank comment line left behind by a removed tag is cleaned up too
• covered by phpast unit tests and apply end-to-end cases