Add license to Logfire API metadata

[Kludex]

• Closes License unclear for logfire-api package #715

[cloudflare-workers-and-pages]

Deploying logfire-docs with    Cloudflare Pages

Latest commit:	c7af223
Status:	✅  Deploy successful!
Preview URL:	https://a1a7b645.logfire-docs.pages.dev
Branch Preview URL:	https://add-license-to-logfire-api.logfire-docs.pages.dev

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (54ff986) to head (c7af223).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #716   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          137       137           
  Lines        11031     11031           
  Branches      1539      1539           
=========================================
  Hits         11031     11031           

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