Add step to select engine when creating a scenario

[rouille]

The following tasks need to be performed to add the feature:

• add the engine key to the _scenario_info attribute (type: dict) of the Create object.
• add the engine attribute to the _Builder object with REISE (type: str) as default value.
• update the update_scenario_info method in the Create object.
• write the set_engine method in the _Builder object (limited to only REISE for now).
• use scripts call.py and extract_data.py associated to engine set by user in the Execute object.

[rouille]

Task 1:

>>> from powersimdata.scenario.scenario import Scenario
>>> s = Scenario('')
>>> s.state.print_scenario_info()
--------------------
SCENARIO INFORMATION
--------------------
plan: 
name: 
state: create
interconnect: 
base_demand: 
base_hydro: 
base_solar: 
base_wind: 
change_table: 
start_date: 
end_date: 
interval: 
engine: 

[rouille]

Tasks 2 & 3:

>>> from powersimdata.scenario.scenario import Scenario
>>> s = Scenario('')
>>> s.state.print_scenario_info()
--------------------
SCENARIO INFORMATION
--------------------
plan: 
name: 
state: create
interconnect: 
base_demand: 
base_hydro: 
base_solar: 
base_wind: 
change_table: 
start_date: 
end_date: 
interval: 
engine: 
>>> s.state.set_builder(['Western'])
Reading bus.csv
Reading plant.csv
Reading gencost.csv
Reading branch.csv
Reading dcline.csv
Reading sub.csv
Reading bus2sub.csv
Reading zone.csv
--> Summary
# Existing study
base | test | pos_base
# Available profiles
demand: ca2020 | ca2030 | v3 | v4
hydro: v1 | v2
solar: v2
wind: v1 | v2
>>> s.state.print_scenario_info()
--------------------
SCENARIO INFORMATION
--------------------
plan: 
name: 
state: create
interconnect: Western
base_demand: 
base_hydro: 
base_solar: 
base_wind: 
change_table: No
start_date: 2016-01-01 00:00:00
end_date: 2016-12-31 23:00:00
interval: 144H
engine: REISE

[rouille]

Task 4:

>>> from powersimdata.scenario.scenario import Scenario
>>> s = Scenario('')
>>> s.state.set_builder(['Western'])
Reading bus.csv
Reading plant.csv
Reading gencost.csv
Reading branch.csv
Reading dcline.csv
Reading sub.csv
Reading bus2sub.csv
Reading zone.csv
--> Summary
# Existing study
base | test | pos_base
# Available profiles
demand: ca2020 | ca2030 | v3 | v4
hydro: v1 | v2
solar: v2
wind: v1 | v2
>>> s.state.builder.set_engine('dummy')
Available engines: REISE
>>> s.state.builder.set_engine('REISE')
>>> s.state.print_scenario_info()
--------------------
SCENARIO INFORMATION
--------------------
plan: 
name: 
state: create
interconnect: Western
base_demand: 
base_hydro: 
base_solar: 
base_wind: 
change_table: No
start_date: 2016-01-01 00:00:00
end_date: 2016-12-31 23:00:00
interval: 144H
engine: REISE