Add Net HTTP persistent adapter compatibility

[madwork]

Explanation

The idea is to allow connection reuse with net http persistent adapter. It should also improve memory footprint by lowering the number of Faraday::Connection objects and quoting net http persistent project description:

Using persistent HTTP connections can dramatically increase the speed of HTTP. Creating a new HTTP connection for every request involves an extra TCP round-trip and causes TCP congestion avoidance negotiation to start over.

Benchmark

The graph below display usage of the gem with the latest version (before) versus this branch (after) for the exact same job. It illustrates that it drastically reduces the number of open connections and port usage.

Usage example

gem "faraday", "~> 2.7", ">= 2.7.11"
gem "faraday-net_http_persistent", "~> 2.1"

openai_client ||= OpenAI::Client.new do |faraday|
  faraday.adapter :net_http_persistent, pool_size: 5 do |http|
    http.idle_timeout = 30
  end
end
thread = openai_client.threads.create
openai_client.messages.create(
  thread_id: thread["id"],
  parameters: {
    role: "user",
    content: "content"
  }
)
run = openai_client.runs.create(
  thread_id: thread["id"],
  parameters: {
    assistant_id: "assistant_id"
  }
)
loop do
  response = openai_client.runs.retrieve(
    id: run["id"],
    thread_id: thread["id"]
  )

  # Begin polling
  case response["status"]
  when "queued", "in_progress"
    sleep 1 # Wait 1s and poll again
  when "completed"
    # TODO
  else
    raise
  end
end

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