Support for IAsyncEnumerable

[gfoidl]

Fixes #37

[codecov]

Codecov Report

Merging #43 into master will decrease coverage by 2.96%.
The diff coverage is 85.96%.

@@            Coverage Diff             @@
##           master      #43      +/-   ##
==========================================
- Coverage   94.46%   91.49%   -2.97%     
==========================================
  Files          18       24       +6     
  Lines         957     1258     +301     
==========================================
+ Hits          904     1151     +247     
- Misses         53      107      +54

Impacted Files	Coverage Δ
source/gfoidl.DataCompression/DataPoint.cs	96.87% <ø> (ø)	⬆️
source/gfoidl.DataCompression/ThrowHelper.cs	86.95% <ø> (ø)	⬆️
...ce/gfoidl.DataCompression/Builders/ArrayBuilder.cs	99.05% <100%> (+0.01%)	⬆️
...DataCompression/Compression/DeadBandCompression.cs	98.46% <100%> (+0.54%)	⬆️
.../gfoidl.DataCompression/DataPointIterator.Empty.cs	100% <100%> (ø)
...Compression/Compression/SwingingDoorCompression.cs	97.14% <100%> (-0.05%)	⬇️
source/gfoidl.DataCompression/Compression.cs	100% <100%> (ø)	⬆️
source/gfoidl.DataCompression/ExtensionMethods.cs	100% <100%> (ø)	⬆️
...foidl.DataCompression/Compression/NoCompression.cs	100% <100%> (+3.84%)	⬆️
source/gfoidl.DataCompression/DataPointIterator.cs	80% <100%> (-2.76%)	⬇️
... and 15 more

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