feat(backend): batch outgoing payments in worker jobs

[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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🚀 Performance Test Results

Test Configuration:

• VUs: 4
• Duration: 1m0s

Test Metrics:

• Requests/s: 40.88
• Iterations/s: 10.23
• Failed Requests: 0.00% (0 of 2466)

📜 Logs

> performance@1.0.0 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..................: 855 kB 14 kB/s
     data_sent......................: 1.8 MB 31 kB/s
     http_req_blocked...............: avg=6.4µs    min=1.61µs   med=5.6µs    max=355.01µs p(90)=6.94µs   p(95)=7.69µs  
     http_req_connecting............: avg=339ns    min=0s       med=0s       max=271.75µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=97.29ms  min=8.15ms   med=70.95ms  max=472.7ms  p(90)=206.24ms p(95)=255.42ms
       { expected_response:true }...: avg=97.29ms  min=8.15ms   med=70.95ms  max=472.7ms  p(90)=206.24ms p(95)=255.42ms
     http_req_failed................: 0.00%  ✓ 0         ✗ 2466
     http_req_receiving.............: avg=92.31µs  min=21.32µs  med=85.55µs  max=1.21ms   p(90)=116.1µs  p(95)=138.68µs
     http_req_sending...............: avg=33.68µs  min=6.18µs   med=26.55µs  max=1.86ms   p(90)=38.12µs  p(95)=48.7µs  
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=97.17ms  min=7.98ms   med=70.67ms  max=472.51ms p(90)=206.11ms p(95)=255.29ms
     http_reqs......................: 2466   40.875046/s
     iteration_duration.............: avg=390.97ms min=196.65ms med=374.59ms max=1.01s    p(90)=522.71ms p(95)=556.36ms
     iterations.....................: 617    10.227049/s
     vus............................: 4      min=4       max=4 
     vus_max........................: 4      min=4       max=4