Covariates CSV file summary display for consortia members

[spanta28]

Feature description:
Show a summary of the columns in csv file as here when user maps it

Sample python code here:
import pandas as pd
covariates_dataframe=pd.read_csv('/coinstac-regression-vbm-master/test/input/local0/simulatorRun/covariates.csv')
print(covariates_dataframe.describe(include='all'))

The pandas summary can be done better with string variables, but its an example to showcase the idea. This could push the users to fix their data as they see the columns showing unusual occurrences of data. Ex: Age min of 0,-99 should convey an issue. @rssk @pixelsaurus @vdcalhoun