improvement: update action parameter to dictionary

[amindadgar]

The action we're using now is an array of integers which it isn't possible to find out which value is related to which analytics. For example, we have an array of [1, 1, 1, 4, 3, 5, 5, 4, 3, 2, 2, 2, 1] which the first value is the minimum number of interactions to be active, and other values each representing the parameter for other analytics.

To make it more transparent, we're gonna update the array to a python dictionary (json object) as below

action = {
    "INT_THR": 1,
    "UW_DEG_THR": 1,
    "PAUSED_T_THR": 1,
    "CON_T_THR": 4,
    "CON_O_THR": 3,
    "EDGE_STR_THR": 5,
    "UW_THR_DEG_THR": 5,
    "VITAL_T_THR": 4,
    "VITAL_O_THR": 3,
    "STILL_T_THR": 2,
    "STILL_O_THR": 2,
    "DROP_H_THR": 2,
    "DROP_I_THR": 1,
}

This update includes additional code updates which would be on the module analyzer_memberactivities.py and the documentation of function compute_member_activity within compute_member_activity.py