Add bodyserializer/accept header to openverse api client to correctly authenticate with the API

[madewithkode]

Add bodyserializer/accept header to openverse api client to correctly authenticate with the API

Fixes

Fixes #5314 by @obulat

Description

The @openverse/api-client package sends the requests for token to the Openverse Django API with the correct parameters but does not serialize the body to the required x-www-form-urlencoded format. This causes the requests to be sent with an empty body. The new changes adds a bodySerializer1 that creates new URLSearchParams from the body object, and stringifies it, thus allowing requests to be sent with correct body objects.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (ov just catalog/generate-docs media-props
  for the catalog or ov just api/generate-docs for the API) where applicable.

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[github-actions]

Latest k6 run output¹

     ✓ status was 200

     checks.........................: 100.00% ✓ 412      ✗ 0   
     data_received..................: 94 MB   389 kB/s
     data_sent......................: 54 kB   224 B/s
     http_req_blocked...............: avg=34.17µs  min=2.32µs   med=4.42µs   max=342.62µs p(90)=147.65µs p(95)=167.74µs
     http_req_connecting............: avg=20.84µs  min=0s       med=0s       max=285.62µs p(90)=98.02µs  p(95)=118.98µs
     http_req_duration..............: avg=159.8ms  min=18.1ms   med=114.99ms max=999.52ms p(90)=356.44ms p(95)=414.71ms
       { expected_response:true }...: avg=159.8ms  min=18.1ms   med=114.99ms max=999.52ms p(90)=356.44ms p(95)=414.71ms
   ✓ http_req_failed................: 0.00%   ✓ 0        ✗ 412 
     http_req_receiving.............: avg=155.11µs min=65.26µs  med=131.67µs max=569.09µs p(90)=240.32µs p(95)=313.94µs
     http_req_sending...............: avg=23.7µs   min=8.19µs   med=22.12µs  max=63.62µs  p(90)=36.92µs  p(95)=42.83µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=159.62ms min=17.96ms  med=114.82ms max=999.26ms p(90)=356.26ms p(95)=414.34ms
     http_reqs......................: 412     1.70933/s
     iteration_duration.............: avg=861.65ms min=418.11ms med=932.99ms max=1.71s    p(90)=1.12s    p(95)=1.5s    
     iterations.....................: 77      0.319462/s
     vus............................: 3       min=0      max=6 
     vus_max........................: 60      min=60     max=60

Footnotes

1. This comment will automatically update with new output each time k6 runs for this PR ↩