fix(server): unique context objects per request

[ardatan]

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🚀 Snapshot Release (alpha)

The latest changes of this PR are available as alpha on npm (based on the declared changesets):

Package	Version	Info
@whatwg-node/server	0.9.33-alpha-20240415113302-e322e5febe74b3947e403216d703c01d0ad478ec	npm ↗︎ unpkg ↗︎

[github-actions]

✅ @benchmarks/node-fetch results (noConsumeBody)

   ✓ active_handles.................: avg=138.34428 min=57       med=137     max=198      p(90)=163     p(95)=168    
     data_received..................: 24 MB  797 kB/s
     data_sent......................: 16 MB  516 kB/s
     http_req_blocked...............: avg=3.73µs    min=601ns    med=1.46µs  max=5.77ms   p(90)=2.03µs  p(95)=2.38µs 
     http_req_connecting............: avg=1.64µs    min=0s       med=0s      max=5.2ms    p(90)=0s      p(95)=0s     
     http_req_duration..............: avg=19.11ms   min=1ms      med=18.57ms max=841.88ms p(90)=25.17ms p(95)=26.78ms
       { expected_response:true }...: avg=19.11ms   min=1ms      med=18.57ms max=841.88ms p(90)=25.17ms p(95)=26.78ms
     http_req_failed................: 0.00%  ✓ 0           ✗ 156369
     http_req_receiving.............: avg=37.34µs   min=8.47µs   med=24.4µs  max=22.55ms  p(90)=39.89µs p(95)=48.73µs
     http_req_sending...............: avg=12.14µs   min=2.62µs   med=6.89µs  max=25.36ms  p(90)=10.34µs p(95)=16µs   
     http_req_tls_handshaking.......: avg=0s        min=0s       med=0s      max=0s       p(90)=0s      p(95)=0s     
     http_req_waiting...............: avg=19.06ms   min=916.46µs med=18.53ms max=841.64ms p(90)=25.12ms p(95)=26.71ms
     http_reqs......................: 156369 5211.826581/s
     iteration_duration.............: avg=38.34ms   min=5.68ms   med=37.28ms max=862.67ms p(90)=42.37ms p(95)=47.48ms
     iterations.....................: 78166  2605.29668/s
     vus............................: 100    min=100       max=100 
     vus_max........................: 100    min=100       max=100 

[github-actions]

✅ @benchmarks/node-fetch results (consumeBody)

   ✓ active_handles.................: avg=139.331793 min=13       med=140     max=195      p(90)=161     p(95)=166    
     data_received..................: 22 MB  742 kB/s
     data_sent......................: 14 MB  475 kB/s
     http_req_blocked...............: avg=2.75µs     min=591ns    med=1.4µs   max=8.74ms   p(90)=2.05µs  p(95)=2.4µs  
     http_req_connecting............: avg=890ns      min=0s       med=0s      max=5.11ms   p(90)=0s      p(95)=0s     
     http_req_duration..............: avg=20.54ms    min=614.62µs med=20ms    max=879.2ms  p(90)=26.57ms p(95)=28.18ms
       { expected_response:true }...: avg=20.54ms    min=614.62µs med=20ms    max=879.2ms  p(90)=26.57ms p(95)=28.18ms
     http_req_failed................: 0.00%  ✓ 0           ✗ 145470
     http_req_receiving.............: avg=37.26µs    min=9.47µs   med=24.99µs max=25.38ms  p(90)=40.23µs p(95)=48.49µs
     http_req_sending...............: avg=13.22µs    min=3.46µs   med=7.07µs  max=21.79ms  p(90)=10.44µs p(95)=15.34µs
     http_req_tls_handshaking.......: avg=0s         min=0s       med=0s      max=0s       p(90)=0s      p(95)=0s     
     http_req_waiting...............: avg=20.49ms    min=587.23µs med=19.96ms max=879.09ms p(90)=26.52ms p(95)=28.1ms 
     http_reqs......................: 145470 4848.106013/s
     iteration_duration.............: avg=41.2ms     min=8.17ms   med=40.01ms max=914.07ms p(90)=45.31ms p(95)=51.03ms
     iterations.....................: 72711  2423.253154/s
     vus............................: 1      min=1         max=100 
     vus_max........................: 100    min=100       max=100 

[github-actions]

✅ @benchmarks/server results

     ✓ no-errors
     ✓ expected-result

   ✓ checks.........................: 100.00% ✓ 268282      ✗ 0     
     data_received..................: 26 MB   881 kB/s
     data_sent......................: 11 MB   358 kB/s
     http_req_blocked...............: avg=1.51µs   min=822ns    med=1.41µs   max=221.56µs p(90)=1.97µs   p(95)=2.2µs   
     http_req_connecting............: avg=1ns      min=0s       med=0s       max=149.83µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=153.49µs min=98.68µs  med=145µs    max=11.31ms  p(90)=165.82µs p(95)=172.78µs
       { expected_response:true }...: avg=153.49µs min=98.68µs  med=145µs    max=11.31ms  p(90)=165.82µs p(95)=172.78µs
     http_req_failed................: 0.00%   ✓ 0           ✗ 134141
     http_req_receiving.............: avg=25.13µs  min=12.36µs  med=23.64µs  max=2.95ms   p(90)=30.83µs  p(95)=33.01µs 
     http_req_sending...............: avg=7.29µs   min=4.1µs    med=7.3µs    max=11.11ms  p(90)=8.84µs   p(95)=10.4µs  
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=121.06µs min=73.18µs  med=112.85µs max=9.64ms   p(90)=130.28µs p(95)=136.01µs
     http_reqs......................: 134141  4471.157271/s
     iteration_duration.............: avg=218.68µs min=145.11µs med=209.62µs max=11.42ms  p(90)=233.77µs p(95)=243.88µs
     iterations.....................: 134141  4471.157271/s
     vus............................: 1       min=1         max=1   
     vus_max........................: 1       min=1         max=1