Batch API requests to ReadMe

[thestrabusiness]

🧰 What's being changed?

This commit adds simple request batching behavior to the middleware.

Previously, each request made to an application using this middleware
would cause a new request to be sent to the ReadMe API. A new
RequestQueue object was introduced to collect requests and provide a
batched response to send out when ready.

The batch size can be controlled by the user using the buffer_length
option. It defaults to 10.

🧪 Testing

Both unit and integrations tests were added to cover the new functionality.

Using the following sample application and curl request, we confirmed that middleware appropriately batches the requests.

curl 'http://localhost:9292/api/foo?id=1&name=joel' -H "X-Filtered: my custom header" -H "Content-Type: application/json" -X POST -d '{"key": "value", "dont_filter": "not filtered"}'

$LOAD_PATH << File.expand_path("../../metrics-sdks/packages/ruby/lib", __FILE__)
require "readme/metrics"

class ApiApp
  def call(env)
    [200, {}, ["Ok"]]
  end
end

map "/api" do
  options = {
    api_key: "YOUR_API_KEY",
    development: false
  }
  use Readme::Metrics, options do |env|
    {id: "anthonym", label: "Anthony M.", email: "[email protected]"}
  end
  run ApiApp.new
end