[UI - Button] Change Viewport shading on active viewports

In some setups, Users may use multiple viewports to view their model / background / animations from various angles at the same time.

If we want to change the shading method in : [EEVEE / cycles] to render preview or solid preview mode, we will have to go viewport by viewport and change every viewport shading mode manually.

[When you have 8 viewports on a multi-monitors setup, that becomes 8 clicks everytime you want to change your viewport shading] (Even when its assigned to shortcuts and favorites)

Suggestion : A UI toggle-able button that "Changes all active viewports shading" into whatever the user selects in one click instead of traversing viewort by viewport.