Extract io layer to writer/reader class

Created by: stefanoborini

Extracted IO layer into writer and reader classes, and create model objects with support from the bundles.

Created by: codecov-io

Codecov Report

Merging #29 into master will increase coverage by 16.36%. The diff coverage is 56.84%.

@@             Coverage Diff             @@
##           master      #29       +/-   ##
===========================================
+ Coverage   12.32%   28.69%   +16.36%     
===========================================
  Files          39       38        -1     
  Lines         430      467       +37     
  Branches       25       29        +4     
===========================================
+ Hits           53      134       +81     
+ Misses        372      324       -48     
- Partials        5        9        +4

Impacted Files	Coverage Δ
force_bdss/data_sources/base_data_source.py	0% <ø> (ø)
force_bdss/data_sources/i_data_source_bundle.py	85.71% <ø> (+10.71%)
...csv_extractor/csv_extractor/csv_extractor_model.py	0% <ø> (ø)
...bdss/core_plugins/dummy_mco/dakota/dakota_model.py	0% <ø> (ø)
...ore_plugins/dummy_kpi/kpi_adder/kpi_adder_model.py	0% <ø> (ø)
...sv_extractor/csv_extractor/csv_extractor_bundle.py	0% <0%> (ø)
force_bdss/base_core_driver.py	0% <0%> (ø)
force_bdss/core_mco_driver.py	0% <0%> (ø)
...re_plugins/dummy_kpi/kpi_adder/kpi_adder_bundle.py	0% <0%> (ø)
force_bdss/bdss_application.py	0% <0%> (ø)
... and 12 more

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