datadog/dd-trace Circumvents open_basedir INI directive

datadog/dd-trace versions 0.30.0 prior to 0.30.2 are affected by a security and stability issue outlined in PR #579. This pull request ensures that the ddtrace.request_init_hook remains bound by the open_basedir INI directive, effectively addressing potential vulnerabilities related to open_basedir restrictions. The update introduces a sandboxing mechanism to isolate the request init hook from errors or exceptions during execution, enhancing the library's stability and preventing adverse impacts on the main script.