Handle docstring doctests repo-wide with separate CI job

[falloficaruss]

No description provided.

[github-actions]

Performance benchmarks:

Model	Size	Init time [95% CI]	Run time [95% CI]
BoltzmannWealth	small	🔵 -2.3% [-2.8%, -1.8%]	🔵 +0.2% [+0.0%, +0.4%]
BoltzmannWealth	large	🔵 -2.0% [-2.5%, -1.5%]	🔵 +0.9% [-0.3%, +2.8%]
Schelling	small	🔵 -0.7% [-1.3%, -0.1%]	🔵 -0.6% [-1.4%, +0.3%]
Schelling	large	🔵 +0.0% [-0.5%, +0.5%]	🔴 +5.4% [+4.1%, +6.8%]
WolfSheep	small	🔵 -2.3% [-2.7%, -1.9%]	🔵 +0.9% [-3.4%, +5.1%]
WolfSheep	large	🔵 -0.6% [-1.3%, +0.1%]	🔵 -0.3% [-1.9%, +1.5%]
SugarscapeG1mt	small	🟢 -4.0% [-4.6%, -3.5%]	🔵 +0.1% [-1.5%, +2.0%]
SugarscapeG1mt	large	🔵 -1.6% [-2.5%, -0.8%]	🔵 +0.2% [-0.6%, +0.8%]
BoidFlockers	small	🔵 -1.1% [-1.5%, -0.8%]	🔵 +0.3% [-0.1%, +0.8%]
BoidFlockers	large	🔵 -1.2% [-1.6%, -0.8%]	🔵 -0.8% [-1.1%, -0.5%]
MultiLevelAllianceModel	small	🔵 -3.4% [-4.8%, -2.0%]	🔵 -0.1% [-0.5%, +0.3%]
MultiLevelAllianceModel	large	🔵 -1.2% [-2.0%, -0.4%]	🔵 -0.0% [-1.4%, +1.3%]