Move total_value_year fields to new table

[roshan-mathewtech]

Ticket#18

Created new table change_stats_total_values to move data in total_value_year fields data from change_stats table

run rake db:migrate to create the new table

Run the below rake task to migrate data from change_stats table to the new change_stats_total_values table
rake migrate:change_stats_total_values

This is still in progress:
ToDo

1. Make changes in the code especially in model/habitat.rb to retrieve total_value by year from the new table
2. Update the specs accordingly
3. create a new migration to remove total_value_year fields from change_stats table

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (c1c2a02) 49.34% compared to head (bd9b6de) 49.34%.

❗ Current head bd9b6de differs from pull request most recent head 627ee39. Consider uploading reports for the commit 627ee39 to get more accurate results

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #249   +/-   ##
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  Coverage    49.34%   49.34%           
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  Files           14       14           
  Lines          379      379           
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  Hits           187      187           
  Misses         192      192           

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