5.7.0-beta.0

• [core] ref: Use Promise as the interface, but SyncPromise as the implementation in all the places we need thenable API
• [browser] fix: Capture only failed console.assert calls
• [browser] ref: Major TraceKit and GlobalHandlers refactor
• [browser] ref: Remove all required IE10-11 polyfills
• [browser] ref: Remove Object.assign method usage
• [browser] ref: Remove Number.isNaN method usage
• [browser] ref: Remove includes method usage
• [browser] ci: Use Galaxy S9 Plus for Android 9
• [browser] ci: Increase timeouts and retries between Travis and BrowserStack
• [node] feat: Extract prototyped data in extractUserData (#2247)
• [node] ref: Use domain Hub detection only in Node environment
• [integrations] feat: Use contexts to handle ExtraErrorData (#2208)
• [types] fix: Breadcrumb data needs to be an object
• [utils] ref: Make Event instances somewhat serializeable