chore(toolkit-lib): include declaration maps so that API extractor can locate the source file

[mrgrain]

With this change

"fileUrlPath": "lib/payloads/hotswap.d.ts",

becomes

"fileUrlPath": "lib/payloads/hotswap.ts",

in toolkit-lib.api.json.

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.01%. Comparing base (65e802f) to head (c3c57ee).
Report is 23 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #592   +/-   ##
=======================================
  Coverage   79.01%   79.01%           
=======================================
  Files          46       46           
  Lines        7085     7085           
  Branches      791      790    -1     
=======================================
  Hits         5598     5598           
  Misses       1468     1468           
  Partials       19       19           

Flag	Coverage Δ
suite.unit	79.01% <ø> (ø)

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