add documentation and example for usage with express+helmet

[EmrysMyrddin]

fixes #2901

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Latest commit: 0fe7c56

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✅ Benchmark Results

     ✓ no_errors{mode:graphql}
     ✓ expected_result{mode:graphql}
     ✓ no_errors{mode:graphql-jit}
     ✓ expected_result{mode:graphql-jit}
     ✓ no_errors{mode:graphql-response-cache}
     ✓ expected_result{mode:graphql-response-cache}
     ✓ no_errors{mode:graphql-no-parse-validate-cache}
     ✓ expected_result{mode:graphql-no-parse-validate-cache}

     checks.......................................: 100.00% ✓ 308588      ✗ 0     
     data_received................................: 1.2 GB  10 MB/s
     data_sent....................................: 62 MB   519 kB/s
     http_req_blocked.............................: avg=1.72µs   min=1µs     med=1.5µs   max=948.01µs p(90)=2.1µs   p(95)=2.29µs  
     http_req_connecting..........................: avg=7ns      min=0s      med=0s      max=659.8µs  p(90)=0s      p(95)=0s      
     http_req_duration............................: avg=518.15µs min=265.6µs med=426.8µs max=35ms     p(90)=756µs   p(95)=785.7µs 
       { expected_response:true }.................: avg=518.15µs min=265.6µs med=426.8µs max=35ms     p(90)=756µs   p(95)=785.7µs 
     ✓ { mode:graphql-jit }.......................: avg=383.52µs min=265.6µs med=338.6µs max=21.51ms  p(90)=400.8µs p(95)=428.7µs 
     ✓ { mode:graphql-no-parse-validate-cache }...: avg=823.48µs min=677.5µs med=753.2µs max=25.16ms  p(90)=816.7µs p(95)=909.32µs
     ✓ { mode:graphql-response-cache }............: avg=446.74µs min=314.9µs med=406.8µs max=16.22ms  p(90)=456.3µs p(95)=470.1µs 
     ✓ { mode:graphql }...........................: avg=540.19µs min=396.9µs med=464.7µs max=35ms     p(90)=549.7µs p(95)=652.89µs
     http_req_failed..............................: 0.00%   ✓ 0           ✗ 154294
     http_req_receiving...........................: avg=30.96µs  min=17.3µs  med=26.8µs  max=9.32ms   p(90)=39µs    p(95)=43µs    
     http_req_sending.............................: avg=13.76µs  min=6.2µs   med=8.4µs   max=4.97ms   p(90)=13.6µs  p(95)=15.4µs  
     http_req_tls_handshaking.....................: avg=0s       min=0s      med=0s      max=0s       p(90)=0s      p(95)=0s      
     http_req_waiting.............................: avg=473.42µs min=236.1µs med=387µs   max=33.74ms  p(90)=718.1µs p(95)=741.3µs 
     http_reqs....................................: 154294  1285.756686/s
     iteration_duration...........................: avg=771.98µs min=482.7µs med=676.7µs max=35.47ms  p(90)=1ms     p(95)=1.04ms  
     iterations...................................: 154294  1285.756686/s
     vus..........................................: 1       min=1         max=1   
     vus_max......................................: 2       min=2         max=2   

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💻 Website Preview

The latest changes are available as preview in: https://f75296bc.graphql-yoga.pages.dev

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Apollo Federation Subgraph Compatibility Results

Federation 1 Support	Federation 2 Support
_service 🟢 @key (single) 🟢 @key (multi) 🟢 @key (composite) 🟢 repeatable @key 🟢 @requires 🟢 @provides 🟢 federated tracing 🟢	@link 🟢 @shareable 🟢 @tag 🟢 @override 🟢 @inaccessible 🟢 @composeDirective 🟢 @interfaceObject 🟢

Learn more:

• Apollo Federation Subgraph Specification
• Compatibility Tests