Return Result<>

[atsyplenkov]

This PR introduces idiomatic Result<> or Option<> as a return values for all Cell:: methods

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 90.64039% with 19 lines in your changes missing coverage. Please review.

Project coverage is 95.25%. Comparing base (4b2c6f4) to head (67b2fba).

Files with missing lines	Patch %	Lines
src/utils.rs	60.00%	12 Missing ⚠️
src/errors.rs	0.00%	6 Missing ⚠️
src/cells.rs	97.36%	1 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master      #10      +/-   ##
==========================================
- Coverage   96.57%   95.25%   -1.33%     
==========================================
  Files           9       10       +1     
  Lines         672      779     +107     
==========================================
+ Hits          649      742      +93     
- Misses         23       37      +14     

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