4.0.0

• BREAKING CHANGE – All clients named *RestClient have been removed except for PlatformApiRestClient. Any removed client logic should now be implemented within components.
• PlatformApiRestClient has been migrated from the request library to axios.
• The following libraries have been removed from the main dependencies:
  • @elastic.io/ntlm-client
  • async
  • bunyan-serializers
  • elasticio-node
  • better-npm-audit
  • remove-leading-slash
  • remove-trailing-slash
  • request
• The axiosReqWithRetryOnServerError function can now operate without requiring a context.