Remove deprecated createObservable and internal

[nikitin-da]

Closes #607

[codecov-io]

Codecov Report

Merging #812 into master will increase coverage by 0.4%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master    #812     +/-   ##
========================================
+ Coverage   96.99%   97.4%   +0.4%     
========================================
  Files          89      89             
  Lines        2727    2694     -33     
  Branches      302     302             
========================================
- Hits         2645    2624     -21     
+ Misses         50      38     -12     
  Partials       32      32

Impacted Files	Coverage Δ
...tentresolver/operations/put/PreparedPutObject.java	100% <ø> (+3.7%)	⬆️
...erations/put/PreparedPutContentValuesIterable.java	91.66% <ø> (-0.14%)	⬇️
...entresolver/impl/DefaultStorIOContentResolver.java	92.42% <ø> (+0.99%)	⬆️
...olver/operations/delete/PreparedDeleteByQuery.java	91.66% <ø> (+3.66%)	⬆️
...orio2/sqlite/operations/put/PreparedPutObject.java	100% <ø> (ø)	⬆️
...ions/delete/PreparedDeleteCollectionOfObjects.java	100% <ø> (+2.27%)	⬆️
...ver/operations/get/PreparedGetNumberOfResults.java	100% <ø> (+3.03%)	⬆️
...olver/operations/get/PreparedGetListOfObjects.java	100% <ø> (+2.27%)	⬆️
...orio2/sqlite/operations/get/PreparedGetObject.java	98.63% <ø> (-0.02%)	⬇️
...tentresolver/operations/get/PreparedGetCursor.java	93.33% <ø> (+3.01%)	⬆️
... and 17 more

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[artem-zinnatullin]

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