Experimental v0.39.0

🚀 (Enhancement)

• feat(otlp-transformer): support log records. #3712 @llc1123
• feat(otlp-grpc-exporter-base): support log records. #3712 @llc1123
• feat(exporter-logs-otlp-grpc): otlp-grpc exporter for logs. #3712 @llc1123
• feat(otlp-grpc-exporter-base): use statically generated protobuf code #3705 @pichlermarc
• refactor(otlp-transformer): refine metric transformers. #3770 @llc1123

🐛 (Bug Fix)

• fix(instrumentation): update require-in-the-middle to v7.1.0 #3727 @trentm
• fix(instrumentation): update require-in-the-middle to v7.0.1 #3743 @trentm

📚 (Refine Doc)

• doc(instrumentation): add limitiations section to readme #3786 @Flarna