4.2.0

• [browser] fix: Make addBreadcrumb sync internally, beforeBreadcrumb is now only sync
• [browser] fix: Remove internal console guard in beforeBreadcrumb
• [core] feat: Integrations now live on the Client. This means that when binding a new Client to the Hub the client
  itself can decide which integration should run.
• [node] ref: Simplify Node global handlers code