fix: Read from cache first on cacheAndNetwork

[budde377]

When fetch policy is cacheAndNetwork, we now return cache and then fetch from the network, if the cached result is available). If not we fetch from the network.

The current implementation always awaits the network response if available. But when the fetch policy is cacheAndNetwork we first want to return the cached result (if available) and then continue to fetch over the network in background. This PR fixes this.

[codecov[bot]]

Codecov Report

Merging #1038 (fb09fe8) into beta (05ca62a) will increase coverage by 0.27%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             beta    #1038      +/-   ##
==========================================
+ Coverage   51.25%   51.53%   +0.27%     
==========================================
  Files          36       36              
  Lines        1389     1397       +8     
==========================================
+ Hits          712      720       +8     
  Misses        677      677              

Impacted Files	Coverage Δ
packages/graphql/lib/src/core/query_manager.dart	68.45% <100.00%> (+1.57%)	:arrow_up:

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[vytautas-pranskunas-]

Thanks guys!

[kuba-asanov]

Good job!