Fire off kotlin 1.5 compatible snapshot

[digitalbuddha]

• Upgrade to kotlin 1.5
• fix Jacoco compat issue
• change snapshot version to 4.0.2-KT15-SNAPSHOT (will auto release post merge)
• • validate all tests pass, update api checks (1.5 changed functions)

fixes #263 which had crashes due to kotlin 1.5 duration class type changes.

We will try to release 1.4 compatible and 1.5 compatible changes for next few months. We will eventually stop supporting 1.4 and instead release only 1.5 compatible versions.

[codecov]

Codecov Report

Merging #273 (542029a) into main (e2c5cbf) will increase coverage by 2.33%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main     #273      +/-   ##
============================================
+ Coverage     83.00%   85.33%   +2.33%     
+ Complexity      182      179       -3     
============================================
  Files            48       49       +1     
  Lines           859      914      +55     
  Branches        129      126       -3     
============================================
+ Hits            713      780      +67     
+ Misses           80       77       -3     
+ Partials         66       57       -9     

Impacted Files	Coverage Δ	Complexity Δ
.../android/external/fs3/filesystem/FileSystemImpl.kt	95.12% <100.00%> (ø)	17.00 <0.00> (+1.00)
...m/dropbox/android/external/store4/StoreDefaults.kt	100.00% <100.00%> (ø)	2.00 <1.00> (ø)
.../dropbox/android/external/store4/impl/RealStore.kt	92.53% <100.00%> (+1.91%)	16.00 <0.00> (ø)
...android/external/store4/impl/RefCountedResource.kt	88.00% <0.00%> (-3.31%)	6.00% <0.00%> (-1.00%)
...in/kotlin/com/dropbox/store/rx2/RxSourceOfTruth.kt	68.18% <0.00%> (-1.82%)	0.00% <0.00%> (ø%)
...in/kotlin/com/dropbox/store/rx3/RxSourceOfTruth.kt	68.18% <0.00%> (-1.82%)	0.00% <0.00%> (ø%)
...main/java/com/dropbox/android/external/fs3/Util.kt	69.23% <0.00%> (-1.14%)	16.00% <0.00%> (-1.00%)
...ava/com/dropbox/android/external/store4/Fetcher.kt	100.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
.../java/com/dropbox/android/external/fs3/FSWriter.kt	100.00% <0.00%> (ø)	3.00% <0.00%> (ø%)
...om/dropbox/android/external/store4/MemoryPolicy.kt	87.50% <0.00%> (ø)	16.00% <0.00%> (+4.00%)
... and 24 more

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