3.9.0

• feat: Add tracePropagationTargets option (#1396)
• feat: Expose a function to retrieve the URL of the CSP endpoint (#1378)
• feat: Add support for Dynamic Sampling (#1360)
  • Add segment to UserDataBag
  • Add TransactionSource, to set information about the transaction name via TransactionContext::setSource() (#1382)
  • Deprecate TransactionContext::fromSentryTrace() in favor of TransactionContext::fromHeaders()