refactor: create URL instance once and pass it in context for onRequestHook

[saihaj]

closes #1486

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Latest commit: 0cd839d

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✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 166764      ✗ 0    
     data_received..................: 22 MB   739 kB/s
     data_sent......................: 9.6 MB  320 kB/s
     http_req_blocked...............: avg=1.26µs   min=800ns   med=1µs     max=342.6µs p(90)=1.6µs   p(95)=1.9µs  
     http_req_connecting............: avg=2ns      min=0s      med=0s      max=177.9µs p(90)=0s      p(95)=0s     
   ✓ http_req_duration..............: avg=277.87µs min=180.2µs med=248.7µs max=20.42ms p(90)=310.1µs p(95)=349.7µs
       { expected_response:true }...: avg=277.87µs min=180.2µs med=248.7µs max=20.42ms p(90)=310.1µs p(95)=349.7µs
     http_req_failed................: 0.00%   ✓ 0           ✗ 83382
     http_req_receiving.............: avg=21.07µs  min=10.8µs  med=18.8µs  max=11.12ms p(90)=25.7µs  p(95)=28.1µs 
     http_req_sending...............: avg=8.53µs   min=4.1µs   med=6.5µs   max=3.64ms  p(90)=11.4µs  p(95)=12.5µs 
     http_req_tls_handshaking.......: avg=0s       min=0s      med=0s      max=0s      p(90)=0s      p(95)=0s     
     http_req_waiting...............: avg=248.27µs min=161.1µs med=221.4µs max=20.3ms  p(90)=276.3µs p(95)=314.3µs
     http_reqs......................: 83382   2779.251117/s
     iteration_duration.............: avg=352.86µs min=235.1µs med=320.8µs max=21ms    p(90)=396.6µs p(95)=442.8µs
     iterations.....................: 83382   2779.251117/s
     vus............................: 1       min=1         max=1  
     vus_max........................: 1       min=1         max=1