[executors/ws] Allow to configure headers

[EmrysMyrddin]

Description

This PR aims to allow users to configure HTTP headers for the WS connection request.
This is needed to allow headers propagation for subscriptions based on WebSockets in Hive Gateway

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

[changeset-bot]

🦋 Changeset detected

Latest commit: d61ee3e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphql-tools/executor-graphql-ws	Minor

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[theguild-bot]

🚀 Snapshot Release (alpha)

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

Package	Version	Info
@graphql-tools/executor-graphql-ws	1.3.0-alpha-20240925200710-d61ee3efd7a824d2ae97ac731770da8ae3a913d0	npm ↗︎ unpkg ↗︎

[github-actions]

✅ Benchmark Results

     ✓ no_errors
     ✓ expected_result

     checks.........................: 100.00% ✓ 330       ✗ 0  
     data_received..................: 38 MB   3.8 MB/s
     data_sent......................: 141 kB  14 kB/s
     http_req_blocked...............: avg=4.29µs   min=2.11µs   med=2.79µs   max=189.93µs p(90)=4.21µs   p(95)=4.82µs  
     http_req_connecting............: avg=726ns    min=0s       med=0s       max=119.89µs p(90)=0s       p(95)=0s      
     http_req_duration..............: avg=56.03ms  min=48.61ms  med=52.61ms  max=160.09ms p(90)=62.37ms  p(95)=82.65ms 
       { expected_response:true }...: avg=56.03ms  min=48.61ms  med=52.61ms  max=160.09ms p(90)=62.37ms  p(95)=82.65ms 
     http_req_failed................: 0.00%   ✓ 0         ✗ 165
     http_req_receiving.............: avg=150.25µs min=107.27µs med=133.51µs max=1.04ms   p(90)=159.11µs p(95)=216.28µs
     http_req_sending...............: avg=25.12µs  min=18.36µs  med=24.26µs  max=73.21µs  p(90)=28.47µs  p(95)=32.05µs 
     http_req_tls_handshaking.......: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting...............: avg=55.85ms  min=48.45ms  med=52.45ms  max=159.59ms p(90)=62.09ms  p(95)=82.48ms 
     http_reqs......................: 165     16.480701/s
     iteration_duration.............: avg=60.65ms  min=52.75ms  med=57.13ms  max=164.22ms p(90)=67.86ms  p(95)=86.81ms 
     iterations.....................: 165     16.480701/s
     vus............................: 1       min=1       max=1
     vus_max........................: 1       min=1       max=1

[github-actions]

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