New 'multipart' option

[ardatan]

No description provided.

[github-actions]

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

@graphql-yoga/common@2.4.2-canary-592080c.0
graphql-yoga@2.5.0-canary-592080c.0
@graphql-yoga/node@2.5.0-canary-592080c.0
@graphql-yoga/render-graphiql@2.5.2-canary-592080c.0

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 201602     ✗ 0     
     data_received..................: 29 MB   968 kB/s
     data_sent......................: 12 MB   386 kB/s
     http_req_blocked...............: avg=1.21µs   min=799ns    med=1.1µs    max=2.79ms  p(90)=1.5µs   p(95)=1.8µs   
     http_req_connecting............: avg=26ns     min=0s       med=0s       max=2.64ms  p(90)=0s      p(95)=0s      
   ✓ http_req_duration..............: avg=222.82µs min=150.79µs med=201.61µs max=16.76ms p(90)=251.1µs p(95)=275.81µs
       { expected_response:true }...: avg=222.82µs min=150.79µs med=201.61µs max=16.76ms p(90)=251.1µs p(95)=275.81µs
     http_req_failed................: 0.00%   ✓ 0          ✗ 100801
     http_req_receiving.............: avg=18.83µs  min=11.2µs   med=17.7µs   max=5.24ms  p(90)=22.9µs  p(95)=25.6µs  
     http_req_sending...............: avg=6.94µs   min=4.1µs    med=5µs      max=3.92ms  p(90)=10.6µs  p(95)=11.4µs  
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s      p(90)=0s      p(95)=0s      
     http_req_waiting...............: avg=197.05µs min=132.39µs med=178.39µs max=16.36ms p(90)=219.7µs p(95)=243.41µs
     http_reqs......................: 100801  3359.87818/s
     iteration_duration.............: avg=291.66µs min=204.89µs med=267.32µs max=16.99ms p(90)=330.2µs p(95)=359.72µs
     iterations.....................: 100801  3359.87818/s
     vus............................: 0       min=0        max=1   
     vus_max........................: 1       min=1        max=1