[manuscript] Add funding acknowledgements

[Kwan-Jenny]

The Funding section of the manuscript is currently a placeholder:

"This work was supported by ~ [TODO]"

Collect the relevant grant numbers from co-authors and fill in. At minimum,
likely sources include:

• NIH/NIAID award R21AI176416 (KA, EM) — same as the serocalculator paper.
• NIH/FIC award K01TW012177 (KA) — same as the serocalculator paper.
• UC Davis School of Medicine Convergence Research Award (KA, JJ, EM, KHL).

Confirm with Kristen and Ezra which funding sources should be listed before
finalising.

Referenced in manuscript at: Funding section.