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When the auto-instrumentation attaches to a process using the global TracerProvider, and there has not been a delegate set, create a span from the go.opentelemetry.io/auto/sdk package so the OTel Go auto-instrumentation can instrument the application by default. Resolve #5702 ### Benchmarks ```terminal goos: linux goarch: amd64 pkg: go.opentelemetry.io/otel/internal/global cpu: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz │ old.txt │ new.txt │ │ sec/op │ sec/op vs base │ StartEndSpanNoSDK-8 244.2n ± 21% 250.2n ± 23% ~ (p=0.739 n=10) ```