improvement: update act_param to dictionary

[amindadgar]

The act_param 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

act_param = {
    "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 assess_engagement.py