Rework asynchronous conversion

[tkrs]

This reworks the clarity of APIs that execute CQL statements with an asynchronous conversion.

[codecov-io]

Codecov Report

Merging #120 into master will decrease coverage by <.01%.
The diff coverage is 18.75%.

@@            Coverage Diff            @@
##           master    #120      +/-   ##
=========================================
- Coverage    58.8%   58.8%   -0.01%     
=========================================
  Files          18      12       -6     
  Lines         318     284      -34     
  Branches       12       8       -4     
=========================================
- Hits          187     167      -20     
+ Misses        131     117      -14

Impacted Files	Coverage Δ
examples/src/main/scala/Main.scala	0% <0%> (ø)	⬆️
...-effect/src/main/scala/agni/catsEffect/async.scala	0% <0%> (ø)
...r-util/src/main/scala/agni/twitterUtil/async.scala	0% <0%> (ø)
monix/src/main/scala/agni/monix/async.scala	0% <0%> (ø)
core/src/main/scala/agni/std/async.scala	100% <100%> (ø)
core/src/main/scala/agni/Cql.scala	50% <50%> (ø)
core/src/main/scala/agni/RowDeserializer.scala	27.27% <0%> (-18.19%)	⬇️
core/src/main/scala/agni/RowDecoder.scala	33.33% <0%> (-8.34%)	⬇️
core/src/main/scala/agni/Serializer.scala	93.05% <0%> (-1.39%)	⬇️
... and 4 more

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