Mongodb support

[PicoCreator]

Adding mongodb support

[codecov]

Codecov Report

Merging #31 (2fbda38) into master (9e51a55) will increase coverage by 13.99%.
The diff coverage is 73.36%.

@@              Coverage Diff              @@
##             master      #31       +/-   ##
=============================================
+ Coverage     44.99%   58.98%   +13.99%     
- Complexity      864     1169      +305     
=============================================
  Files            82       85        +3     
  Lines          5301     5881      +580     
  Branches        927     1001       +74     
=============================================
+ Hits           2385     3469     +1084     
+ Misses         2591     1977      -614     
- Partials        325      435      +110     

Impacted Files	Coverage Δ
src/main/java/picoded/dstack/FileWorkspace.java	29.41% <0.00%> (-12.26%)	⬇️
.../picoded/dstack/mongodb/MongoDB_DataObjectMap.java	81.01% <ø> (-0.24%)	⬇️
src/main/java/picoded/dstack/KeyLongMap.java	62.85% <33.33%> (+7.30%)	⬆️
...n/java/picoded/dstack/core/Core_FileWorkspace.java	66.29% <47.82%> (-7.56%)	⬇️
...ava/picoded/dstack/core/Core_FileWorkspaceMap.java	62.50% <53.12%> (+1.07%)	⬆️
...a/picoded/dstack/stack/Stack_FileWorkspaceMap.java	69.79% <54.16%> (-9.70%)	⬇️
...va/picoded/dstack/mongodb/MongoDB_KeyValueMap.java	80.00% <80.00%> (ø)
...coded/dstack/mongodb/MongoDB_FileWorkspaceMap.java	81.38% <81.38%> (ø)
...main/java/picoded/dstack/mongodb/MongoDBStack.java	72.72% <83.33%> (+4.30%)	⬆️
...ava/picoded/dstack/mongodb/MongoDB_KeyLongMap.java	84.54% <84.54%> (ø)
... and 27 more

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