ddtrace 2.0.4 on Python PyPI

ASM: fix a body read problem on some corner case where passing empty content length makes wsgi.input.read() blocks.

CI Visibility: fixes distributed tracing when using the CI Visibility integration
CI Visibility: fixes an issue where class-based test methods with the same name across classes would be considered duplicates, and cause one (or more) tests to be dropped from results, by adding --ddtrace-include-class-name as an optional flag (defaulting to false) to prepend the class name to the test name.
dynamic instrumentation: fix an issue that caused function probes on the same module to fail to instrument and be reported in the ERROR status in the UI if the module was not yet imported.
sampling: This fix reverts a refactor which affected how the tracer handled the trace-agent's recommended trace sampling rates, leading to an unintended increase in traces sampled.
Vulnerability Management for Code-level (IAST): Fix potential string id collisions that could cause false positives with non tainted objects being marked as tainted.
lib-injection: Update package files to not be world-writable.