Add SDK support for withinCenterSphere queries

[madsb]

This commit adds support for $centerSphere queries. Parse Server pull request here: parse-community/parse-server#4060

[codecov]

Codecov Report

Merging #467 into master will decrease coverage by 0.18%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #467      +/-   ##
==========================================
- Coverage   85.41%   85.23%   -0.19%     
==========================================
  Files          46       46              
  Lines        3730     3738       +8     
  Branches      854      855       +1     
==========================================
  Hits         3186     3186              
- Misses        544      552       +8

Impacted Files	Coverage Δ
src/ParseQuery.js	92.45% <0%> (-2.12%)	⬇️

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