feat: add Serve(w, r) to support serverless services like vercel

[kevwan]

trafficstars

fix #4892

also, we need to avoid the problem mentioned in #4639

see also https://vercel.com/docs/functions/runtimes/go

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.86%. Comparing base (8690859) to head (ff5bb21). Report is 376 commits behind head on master.

Additional details and impacted files

Files with missing lines	Coverage Δ
rest/server.go	96.93% <100.00%> (+0.40%)	:arrow_up:

... and 20 files with indirect coverage changes

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[jaronnie]

You should bind routes to router. also, need to avoid the problem mentioned in https://github.com/zeromicro/go-zero/issues/4639

[fondoger]

ng.withTimeout() is not applied when using server.ServeHTTP()

Can you expose this method so that we can use it on our own http.Server?

[fondoger]

Add my implementation proposal: https://github.com/zeromicro/go-zero/pull/4909

[kevwan]

Duplicate of #5001