Part2. Implement optional for SQLite

[nikitin-da]

Part of #685

Feedback about Optional class implementation is welcome ;)

[codecov-io]

Codecov Report

Merging #848 into master will increase coverage by 0.09%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #848      +/-   ##
============================================
+ Coverage     97.24%   97.33%   +0.09%     
- Complexity      778      799      +21     
============================================
  Files            91       92       +1     
  Lines          2646     2662      +16     
  Branches        297      298       +1     
============================================
+ Hits           2573     2591      +18     
+ Misses           45       44       -1     
+ Partials         28       27       -1

Impacted Files	Coverage Δ	Complexity Δ
...orio2/sqlite/operations/delete/PreparedDelete.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...qlite/operations/delete/PreparedDeleteByQuery.java	100% <ø> (ø)	6 <0> (ø)	⬇️
...esh/storio2/sqlite/operations/put/PreparedPut.java	100% <ø> (ø)	2 <0> (ø)	⬇️
...esh/storio2/sqlite/operations/get/PreparedGet.java	100% <ø> (ø)	6 <0> (ø)	⬇️
...tentresolver/operations/get/PreparedGetObject.java	100% <ø> (ø)	7 <0> (ø)	⬇️
...shtorefresh/storio2/sqlite/LoggingInterceptor.java	100% <ø> (ø)	4 <0> (ø)	⬇️
...om/pushtorefresh/storio2/test/ToStringChecker.java	79.72% <100%> (+2.09%)	23 <0> (ø)	⬇️
...m/pushtorefresh/storio2/sqlite/impl/ChainImpl.java	100% <100%> (ø)	5 <0> (ø)	⬇️
.../main/java/com/pushtorefresh/storio2/Optional.java	100% <100%> (ø)	21 <21> (?)
...orio2/sqlite/operations/get/PreparedGetObject.java	100% <100%> (ø)	5 <1> (ø)	⬇️
... and 1 more

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[geralt-encore]

Looks good!