Holding/Preparing shield statistic

Snapshot 20w19a recently fixed an old bug concerning minecraft.used:minecraft.shield. While this was a nice change, the scoreboard objective only increments when the shield deflects attacks, not when the shield is held up. Since minecraft.used:minecraft.shield has its own applications, I am not advocating for reworking the existing statistic. That's why I propose one of 2 new statistics/objectives.

Case A: The new statistic increments by 1 every time the player holds right click on a shield (like minecraft.custom:minecraft.clean_banner)

Case B: The new statistic increments by 1 every tick the player holds right click on a shield (like minecraft.custom:minecraft.sneak_time)

These new objectives could fall under the minecraft.custom category like how cleaning banners does not constitute as "using" a banner.