Add helper functions to DataStore

[samup4web]

Description

Add new helper function to DataStore. As mentioned and requested by @lexious89 , I have added these changes and it provides the appropriate dataset needed for calculating device location.

The newly added function are best used alongside GetDistinctMacAddrs function. A typical use will be:

• Use GetDistinctMacAddrs to fetch all unique mac_addrs for a specific device.
• Use GetRssiSeriesData to get a list of rssi values for a particular mac_addr, by specifying device_name and mac_addr
• If needed, a matrix dataset of rssi value can be returned is more than one mac_addr is specified. See return value example - { ("ee:44:43:a5:ff:ef", { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }), ("11:65:d4:fe:ee:ff", { 100, 103, 106, 109, 112, 115, 118, 121, 124, 127 }), ("01:23:dd:3e:4c:cc", { 0, 2, 4, 6, 8, 10, 12, 14, 16, 18 }) }

This pull request also include RSSI datatype change from double to int32_t

Solved issue(s)

61

62

[codecov-io]

Codecov Report

Merging #63 into dev will increase coverage by 1.27%. The diff coverage is 75%.

@@            Coverage Diff             @@
##              dev      #63      +/-   ##
==========================================
+ Coverage   68.39%   69.66%   +1.27%     
==========================================
  Files           9        9              
  Lines         367      389      +22     
==========================================
+ Hits          251      271      +20     
- Misses        116      118       +2

Impacted Files	Coverage Δ
server/include/localization.hpp	100% <ø> (ø)	:arrow_up:
server/src/localization.cpp	0% <ø> (ø)	:arrow_up:
server/include/data_store.hpp	100% <ø> (ø)	:arrow_up:
server/include/types.hpp	100% <ø> (ø)	:arrow_up:
server/src/ins_service.cpp	32.5% <0%> (ø)	:arrow_up:
server/src/data_store.cpp	86.18% <91.3%> (+0.79%)	:arrow_up:

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[samup4web]

Closing the pull request since I need to update this with more commits.