feat(token-introspection): simplify token-introspection package

[njlie]

Changes proposed in this pull request

Context

Checklist

• Related issues linked using fixes #number
• Tests added/updated
• Make sure that all checks pass
• Bruno collection updated (if necessary)
• Documentation issue created with user-docs label (if necessary)
• OpenAPI specs updated (if necessary)

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[github-actions]

🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 45.92
• Iterations/s: 15.31
• Failed Requests: 0.00% (0 of 2762)

📜 Logs

> [email protected] run-tests:testenv /home/runner/work/rafiki/rafiki/test/performance
> ./scripts/run-tests.sh -e test "-k" "-q" "--vus" "4" "--duration" "1m"

Cloud Nine GraphQL API is up: http://localhost:3101/graphql
Cloud Nine Wallet Address is up: http://localhost:3100/
Happy Life Bank Address is up: http://localhost:4100/
cloud-nine-wallet-test-backend already set
cloud-nine-wallet-test-auth already set
happy-life-bank-test-backend already set
happy-life-bank-test-auth already set
     data_received..................: 963 kB 16 kB/s
     data_sent......................: 2.0 MB 33 kB/s
     http_req_blocked...............: avg=6.6µs    min=2.21µs   med=5.18µs   max=607.68µs p(90)=6.25µs   p(95)=6.83µs  
     http_req_connecting............: avg=375ns    min=0s       med=0s       max=566.44µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=86.46ms  min=9.57ms   med=71.5ms   max=593.59ms p(90)=148.58ms p(95)=174.35ms
       { expected_response:true }...: avg=86.46ms  min=9.57ms   med=71.5ms   max=593.59ms p(90)=148.58ms p(95)=174.35ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 2762
     http_req_receiving.............: avg=84.9µs   min=24.7µs   med=76.45µs  max=2.15ms   p(90)=110.44µs p(95)=135.85µs
     http_req_sending...............: avg=35.85µs  min=9.05µs   med=26.87µs  max=2.44ms   p(90)=40.74µs  p(95)=55.32µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=86.34ms  min=9.42ms   med=71.42ms  max=593.26ms p(90)=148.48ms p(95)=174.22ms
     http_reqs......................: 2762   45.916418/s
     iteration_duration.............: avg=260.92ms min=164.11ms med=248.12ms max=1.07s    p(90)=322.79ms p(95)=348.86ms
     iterations.....................: 921    15.311014/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4