Shift sugarscape example to using create_agent

[quaquel]

Shift sugarscape example to using create_agent.

I want to update this example with property layers at some point, so I only moved the Trader agent over.

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 -1.1% [-2.2%, +0.0%]	🔵 +1.2% [+1.1%, +1.3%]
BoltzmannWealth	large	🔵 -0.9% [-1.5%, -0.3%]	🔵 +0.2% [-2.1%, +2.2%]
Schelling	small	🔵 -1.0% [-1.2%, -0.8%]	🔵 -0.9% [-1.1%, -0.7%]
Schelling	large	🔵 -1.5% [-1.9%, -1.1%]	🔵 -2.3% [-3.5%, -1.2%]
WolfSheep	small	🔵 -0.2% [-0.6%, +0.1%]	🔵 -1.0% [-2.2%, +0.1%]
WolfSheep	large	🔵 +0.4% [-0.8%, +1.4%]	🔵 -2.7% [-4.1%, -1.5%]
BoidFlockers	small	🔵 +2.4% [+1.9%, +2.9%]	🔵 +0.5% [-0.3%, +1.3%]
BoidFlockers	large	🔵 +1.6% [+0.8%, +2.3%]	🔵 +1.1% [+0.6%, +1.7%]

[tpike3]

LGTM--- Create agent is very cool and makes sense about the property layer