[clang-tidy] Add an option in 'readability-named-parameter' to print names without comment (#147953)
Add InsertPlainNamesInForwardDecls option to readability-named-parameter
check to insert parameter names without comments for forward
declarations only.
When enabled, forward declarations get plain parameter names (e.g., `int
param`) while function definitions continue to use commented names
(e.g., `int /*param*/`). Named parameters in forward decls don't cause
compiler warnings and some developers prefer to have names without
comments but in sync between declarations and the definition.
Default behavior remains unchanged
(InsertPlainNamesInForwardDecls=false).
Example with InsertPlainNamesInForwardDecls=true:
```cpp
// Forward declaration - gets plain name because the definition has name.
void func(int param);
void func(int param) { ... = param; }
```
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