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

Attention: Patch coverage is 0% with 16 lines in your changes missing coverage. Please review.

Project coverage is 37.11%. Comparing base (bc3a0c8) to head (665ef62).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/core/src/api/interactions.ts	0.00%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10646      +/-   ##
==========================================
- Coverage   37.91%   37.11%   -0.81%     
==========================================
  Files         239      239              
  Lines       14877    15144     +267     
  Branches     1376     1370       -6     
==========================================
- Hits         5641     5620      -21     
- Misses       9225     9513     +288     
  Partials       11       11              

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