TreeLopper | Shift Toggibility

**Is your feature request related to a problem? Please describe.**
Players, when they are chopping down trees, don't always want to chop down the entire tree. Having a simple, togglable, feature for players allows them more choice in how they chop down their trees.

**Describe the solution you'd like**
An option in mechanisms.yml under TreeLopper to have the option to enable a feature that when a player is shifting, it will only break the one block rather than chopping down the entire tree.

**Describe alternatives you've considered**
I have considered making a small plugin to give players permission whenever they shift-click to negate craftbook.mech.treelopper.use permission. However, that seems really impractical and could lead to problems with Luckperms and when I am editing permissions.

**Additional context**
I can't think of any additional context to put here.