properties manager: expose pin visibility property in symbol editor

Description

In the symbol editor, the properties manager doesn't expose the "visible" property of pins. It would be nice if this were exposed in the properties manager.

Steps to reproduce

1. Open a symbol in the symbol editor
2. select a pin
3. look at the available properties in the properties manager

KiCad Version

Application: KiCad Symbol Editor x86_64 on x86_64

Version: 8.0.0-rc2-151-g96297b50a1, release build

Libraries:
	wxWidgets 3.2.4
	FreeType 2.13.2
	HarfBuzz 8.3.0
	FontConfig 2.15.0

Platform: Arch Linux, 64 bit, Little endian, wxGTK, X11, KDE, x11

	wxWidgets: 3.2.4 (wchar_t,wx containers) GTK+ 3.24
	Boost: 1.83.0
	OCC: 7.7.2
	Curl: 8.5.0
	ngspice: 41
	Compiler: GCC 13.2.1 with C++ ABI 1018

Build settings:
	KICAD_USE_EGL=ON