Set total when side-loading data into a resource

[tomdye]

Type: bug
The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier as per the readme code style guidelines
• Unit or Functional tests are included in the PR

Description:

This PR fixes an issue where the data total was not being set when set was used to side-load the resource data.

Resolves #700

[codecov]

Codecov Report

Merging #701 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #701      +/-   ##
==========================================
+ Coverage   97.76%   97.79%   +0.02%     
==========================================
  Files         119      119              
  Lines        6924     6925       +1     
  Branches     1572     1572              
==========================================
+ Hits         6769     6772       +3     
+ Misses        155      153       -2     

Impacted Files	Coverage Δ
src/core/resource.ts	95.91% <100.00%> (+1.39%)	⬆️

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