Make `particle` a required keyword to `ParticleTracker.load_particles`?

[pheuer]

Feature description

Right now this method assumes that the particles being added are protons, but I wonder if that's really a good default? Maybe that keyword should be required, just to be explicit?

@particle_input
    def load_particles(
        self,
        x,
        v,
        particle: Particle = Particle("p+"), 

Motivation

Avoid anyone accidentally creating particles with the wrong mass/charge

Implementation strategy

No response

Additional context

No response

[namurphy]

I'm in favor of this! Having implicit particle defaults makes silent errors more likely.

Related to: #453.

[JaydenR2305]

Ok sounds good, should I implement this in #2712 ? Or should this get its own PR

[pheuer]

Ok sounds good, should I implement this in #2712 ? Or should this get its own PR

Maybe make it it's own, small PR, since it is a potential breaking change to the interface.