add sorting query parameters by key #127
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About the changes
Adds sorting query parameters so it's easier to cache them on CDN.
Before
Query parameters seemed to be randomly structured:

After
Query params are sorted. See also unit test.

Important files
Sources/UnleashProxyClientSwift/Poller/Poller.swift
Discussion points
I understand that maybe not everyone will benefit from this small change. However with bigger traffic this can simplify and reduce costs on cache layer.