Version 1.19.0/0.40b0

• Drop setuptools runtime requirement. (#3372)
• Update the body type in the log ($3343)
• Add max_scale option to Exponential Bucket Histogram Aggregation (#3323)
• Use BoundedAttributes instead of raw dict to extract attributes from LogRecord (#3310)
• Support dropped_attributes_count in LogRecord and exporters (#3351)
• Add unit to view instrument selection criteria (#3341)
• Upgrade opentelemetry-proto to 0.20 and regen #3355)
• Include endpoint in Grpc transient error warning #3362)
• Fixed bug where logging export is tracked as trace #3375)