feat(interactions): add launchActivity method

[imnaiyar]

Please describe the changes this PR makes and why it should be merged:
#10640 but for core

Depends on

• feat(payloads): add entrypoint command payloads discord-api-types#1166

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR changes the library's interface (methods or parameters added)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 37.96%. Comparing base (9fea069) to head (f5c91ae).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10646   +/-   ##
=======================================
  Coverage   37.96%   37.96%           
=======================================
  Files         239      239           
  Lines       14877    14877           
  Branches     1377     1377           
=======================================
  Hits         5648     5648           
  Misses       9218     9218           
  Partials       11       11           

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