Improvements to load_billion_data

[mjkanji]

This PR updates the various functions relating to WHDH downloads to be compatible with the latest changes to the whdh package.

• It updates load_billion_data to work with the whdh::downlaod_data_asset function and ;
• allows the user to specify a version of the data_asset to be downloaded. (The date_filter argument, which the new version argument replaces, was previously just a placeholder and non-functional.)

[mjkanji]

Task linked: CU-21fm1cm Update load_billion_data to work with the latest changes to the whdh package

[codecov-commenter]

Codecov Report

Merging #51 (f228ae7) into main (5e54967) will decrease coverage by 0.11%. The diff coverage is 63.04%.

@@            Coverage Diff             @@
##             main      #51      +/-   ##
==========================================
- Coverage   85.57%   85.46%   -0.12%     
==========================================
  Files          41       41              
  Lines        4278     4293      +15     
==========================================
+ Hits         3661     3669       +8     
- Misses        617      624       +7     

Impacted Files	Coverage Δ
R/load_data.R	11.66% <32.00%> (-1.50%)	:arrow_down:
R/accelerate_uhc.R	99.48% <100.00%> (ø)
R/utils_asserts.R	45.30% <100.00%> (+0.90%)	:arrow_up:
R/utils_whdh.R	73.41% <100.00%> (+1.79%)	:arrow_up:

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