Remove usage of parallelStream in favor of stream

[zack13532]

Changes all usages of parallelStream to stream in the client as it uses the common ForkJoinPool which probably hurts more than it helps.

fixes gh-49

[zack13532]

• Enqueue calls with the OkHttp client's ExecutorService #93 : 2 dependent PRs (#94 , #97 )
• Pass index into callback #96
• Set request index as a header #95
• Use tags to assign responses to result list #92
• Remove usage of parallelStream in favor of stream #91 👈 (View in Graphite)
• Update changelog for 0.9.2 #90
• Update readme with usage examples and bump version #89
• main

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[emmap321]

Good find! Agree that we should fix this and ask them o try again. I found an old thread on this and pooja mentioned that it doesn't have any performance benefits. @poojabhat0 do you recall the reason?