Changelog:
==============
Move set_transaction_name out of event processor in fastapi/starlette (#1751)
Expose proxy_headers as top level config and use in ProxyManager: https://docs.sentry.io/platforms/python/configuration/options/#proxy-headers (#1746)
Signed-off-by: Zheng Ruoqin <zhengrq.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
