Update triage configuration parameters to reasonable defaults

[rayidghani]

feature_start_date, feature_end_date should default to min and max dates from all feature tables

• reads from config file, does queries in from_objs, and populates values for timechop

label_start_time and label_end_time should default yo min and max dates from labels

model_update_frequency = 100 years
training_as_of_date_frequencies = 100 years
test_as_of_date_frequencies = 100 years
max_training_histories: 100 years
test_durations: 0 days will give a single prediction immediately after training end)
test_label_timespans = training_label_timespan

cohort_conifg:
query: every entity in the data select distinct entity_id from ...
name: all_entities_cohort

label_config:

include_missing_labels_in_train_as: null
name: default = outcome

model_grid_config

add a new parameter for model_grid_preeset that can take one of 5 values - quick (seconds), small (minutes), medium (hours), large (day), xlarge (days)
if we see model_grid defined, then ignore the preset parameter. if nothing is set, then default to quicktrial - give warning