Storing the generation time

[mghosh00]

Is your feature request related to a problem? Please describe.
We wish to store the generation time of a pandemic.

Describe the solution you'd like
We will record the latency period of the primary infector (during the infection) and add this to the exposure_period of the secondary infector (already defined in the code as the time between primary infector status I and secondary infector status E).

Additional context
This will be used in calculating the case reproduction number later down the line.

[mghosh00]

Changes to be made:

core

Person

• Need a self.generation_time_dict
• Need a self.primary_infector_latency_period and corresponding setter
• Need a store_generation_time function akin to store_serial_interval

routine

Simulation

• Everything serial interval related needs to be copied for generation time

sweep

HostProgressionSweep

• Need a person.store_generation_time() call

HouseholdSweep, PlaceSweep, SpatialSweep

• Need an extra line with infectee.set_primary_infector_latency_period()

tests

• Person
• Simulation
• HostProgressionSweep
• HouseholdSweep
• PlaceSweep
• SpatialSweep