Allow IO/logger/proc as debugging configuration for all clients

[drnic]

Currently to enable faraday logging to STDOUT, each Groq::Client needs a setup like:

    logger = Logger.new($stdout)
    logger.level = Logger::DEBUG

    @client = Groq::Client.new do |faraday|
      # Log request and response bodies
      faraday.response :logger, logger, bodies: true
    end

Perhaps we can have configuration for this, which provides a corresponding Groq::Client.new(&block).

Perhaps allow:

• an IO:

  Groq.configuration do |c|
    c.logger = $stdout
  

• a Logger:

  logger = Logger.new($stdout)
  logger.level = Logger::DEBUG
  
  Groq.configuration do |c|
    c.logger = logger
  

• or a &faraday_middleware proc

  logger = Logger.new($stdout)
  logger.level = Logger::DEBUG
  faraday_middleware = proc do |faraday|
    # Log request and response bodies
    faraday.response :logger, logger, bodies: true
  end
  
  Groq.configuration do |c|
    c.faraday_middleware = faraday_middleware
  

These examples would all produce the same Proc that's provided to all Groq::Client instances.

If a Groq::Client.new(&block) was explictly provided, then a warning would be posted that the logger or faraday_middleware configuration is being ignored.