query() API returns also "last_id" field; items are grouped under "sectors" or "inputs" keys

[palazzem]

Overview

• Updates client.query() API to return also a last_id that is needed to use the long-polling API (it will be used by another component).
• Items are grouped under sectors or inputs keys

Returned object has the following structure:

{
"last_id": 4,
"sectors": {
    0: {
        "element": 1,
        "id": 1,
        "index": 0,
        "excluded": False,
        "name": "Living Room",
    },
    1: {
        "element": 2,
        "id": 2,
        "index": 1,
        "excluded": False,
        "name": "Bedroom",
    },
    2: {
        "element": 3,
        "id": 3,
        "index": 2,
        "excluded": False,
        "name": "Kitchen",
    },
}

# or

{
"last_id": 4,
"inputs": {
    0: {
        "element": 1,
        "id": 1,
        "index": 0,
        "excluded": False,
        "name": "Living Room",
    },
    1: {
        "element": 2,
        "id": 2,
        "index": 1,
        "excluded": False,
        "name": "Bedroom",
    },
    2: {
        "element": 3,
        "id": 3,
        "index": 2,
        "excluded": False,
        "name": "Kitchen",
    },
}

[codecov-commenter]

Codecov Report

Merging #73 (bb2095d) into master (188da6b) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #73   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            5         5           
  Lines          265       268    +3     
=========================================
+ Hits           265       268    +3     

Impacted Files	Coverage Δ
elmo/api/client.py	100.00% <100.00%> (ø)

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