5.0.0-beta1

Migration from v4

This major bump brings a lot of internal improvements. If you were using the SDK without any special abilities,
basically, the way we describe it in the docs, you should be fine by just updating it. This is a breaking release
since we removed some methods from the public API and removed some classes from the default export.

• breaking [node] fix: Events created from exception shouldn't have top-level message attribute
• [utils] ref: Update wrap method to hide internal sentry flags
• [utils] fix: Make internal Sentry flags non-enumerable in fill utils
• [utils] ref: Move SentryError + PromiseBuffer to utils
• breaking [core] ref: Use SyncPromise internally, this reduces memory pressure by a lot.
• breaking [browser] ref: Removed BrowserBackend from default export.
• breaking [node] ref: Removed BrowserBackend from default export.
• breaking [core] feat: Disable client once flushed using close method
• ref: Move internal ExtendedError to a types package
• breaking [core] ref: Pass Event to sendEvent instead of already stringified data
• [utils] feat: Introduce isSyntheticEvent util
• breaking [utils] ref: remove isArray util in favor of Array.isArray
• breaking [utils] ref: Remove isNaN util in favor of Number.isNaN
• breaking [utils] ref: Remove isFunction util in favor of typeof === 'function'
• breaking [utils] ref: Remove isUndefined util in favor of === void 0
• breaking [utils] ref: Remove assign util in favor of Object.assign
• breaking [utils] ref: Remove includes util in favor of native includes
• breaking [utils] ref: Rename serializeKeysToEventMessage to keysToEventMessage
• breaking [utils] ref: Rename limitObjectDepthToSize to normalizeToSize and rewrite its internals
• breaking [utils] ref: Rename safeNormalize to normalize and rewrite its internals
• breaking [utils] ref: Remove serialize, deserialize, clone and serializeObject functions
• breaking [utils] ref: Rewrite normalization functions by removing most of them and leaving just normalize and
  normalizeToSize
• breaking [core] ref: Extract all pluggable integrations into a separate @sentry/integrations package
• breaking [core] ref: Move extraErrorData integration to @sentry/integrations package
• [core] feat: Add maxValueLength option to adjust max string length for values, default is 250.
• [hub] feat: Introduce setExtras, setTags, clearBreadcrumbs.
• breaking [all] feat: Move Mechanism to Exception
• [browser/node] feat: Add synthetic to Mechanism in exception.
• [browser/node] fix: Use addExceptionTypeValue in helpers
• [browser] ref: Remove unused TraceKit code
• breaking [all] build: Expose module in package.json as entry point for esm builds.
• breaking [all] build: Use es6 target instead of esnext for ESM builds
• [all] feat: Prefix all private methods with _
• [all] build: Use terser instead of uglify
• [opentracing] feat: Introduce @sentry/opentracing providing functions to attach opentracing data to Sentry Events
• breaking [core] ref: Dedupe Integration is now optional, it is no longer enabled by default.
• breaking [core] ref: Removed default client fingerprinting for messages
• [node] ref: Remove stack-trace dependencies