Add plugin for using hesim inline

[mclements]

Devin: can you check this addition, please? It should allow for using hesim inline. Kindly, Mark.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes are missing coverage. Please review.

Project coverage is 92.36%. Comparing base (e218e24) to head (c0ae167).

❗ Current head c0ae167 differs from pull request most recent head 979b098. Consider uploading reports for the commit 979b098 to get more accurate results

Files	Patch %	Lines
R/utils.R	0.00%	9 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
- Coverage   92.51%   92.36%   -0.15%     
==========================================
  Files          64       64              
  Lines        5544     5553       +9     
==========================================
  Hits         5129     5129              
- Misses        415      424       +9     

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[mclements]

I have now made the inline plugin internal -- which addresses an issue with .pkgdown.

[mclements]

Closing and re-opening to re-check:)

(I now realise that this is not needed)

[dincerti]

Thanks for the PR @mclements. Just a couple of minor comments. Also just curious: what is your intended use case for this?