Update to Kotlin 1.4.0, Coroutines 1.3.9 and revert to using Duration.INFINITE

[ychescale9]

I ran into the same Duration issue after updating Kotlin to 1.4.0-rc so here's a PR to update Store to compile with kotlin 1.4.0-rc and revert @chrisbanes 's workaround (tested snapshot artifact locally).

Also fixed a bunch of type inference issues raised by the new compiler.

Update: just updated to kotlin 1.4.0 and Coroutines 1.3.9.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@ecc3470). Click here to learn what that means.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #195   +/-   ##
=======================================
  Coverage        ?   84.16%           
  Complexity      ?      233           
=======================================
  Files           ?       54           
  Lines           ?      998           
  Branches        ?      168           
=======================================
  Hits            ?      840           
  Misses          ?       85           
  Partials        ?       73           

Impacted Files	Coverage Δ	Complexity Δ
...d/external/store4/impl/SourceOfTruthWithBarrier.kt	86.04% <ø> (ø)	7.00 <0.00> (?)
...otlin/com/dropbox/android/external/cache4/Cache.kt	100.00% <100.00%> (ø)	0.00 <0.00> (?)
...n/kotlin/com/dropbox/flow/multicast/Multicaster.kt	96.66% <100.00%> (ø)	8.00 <0.00> (?)
.../dropbox/android/external/store4/impl/RealStore.kt	94.64% <100.00%> (ø)	16.00 <0.00> (?)
...droid/external/store4/impl/operators/MapIndexed.kt	0.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...otlin/com/dropbox/android/external/cache4/Clock.kt	100.00% <0.00%> (ø)	0.00% <0.00%> (?%)
...m/dropbox/android/external/fs3/SourceFileWriter.kt	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
.../android/external/fs3/filesystem/FileSystemImpl.kt	95.12% <0.00%> (ø)	16.00% <0.00%> (?%)
...droid/external/fs3/filesystem/FileSystemFactory.kt	100.00% <0.00%> (ø)	2.00% <0.00%> (?%)
... and 48 more

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[eyalgu]

As we're approaching beta, I think we'd probably avoid targeting an rc release and wait till the official 1.4 release.