refactor: rename Serve → Handle

[mccutchen]

A quick rename, because this high level API could be used for either the client or the server end of a websocket connection.

[github-actions]

🔥 Run benchmarks comparing 88c11de against main:

gh workflow run bench.yaml -f pr_number=69

Note: this comment will update with each new commit.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.11%. Comparing base (912ea1b) to head (88c11de).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #69   +/-   ##
=======================================
  Coverage   98.11%   98.11%           
=======================================
  Files           2        2           
  Lines         425      425           
=======================================
  Hits          417      417           
  Misses          4        4           
  Partials        4        4           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.