refactor(sdk-trace-base)!: remove Span class from exports · open-telemetry/opentelemetry-js@51220f9

Build 🔧: packages/opentelemetry-sdk-trace-node/test/NodeTracerProvider.test.ts#L111

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-sdk-trace-node/test/NodeTracerProvider.test.ts#L130

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-sdk-trace-node/test/NodeTracerProvider.test.ts#L144

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L24

'Span' is declared but its value is never read.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L61

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L115

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L166

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L211

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L242

'Span' only refers to a type, but is being used as a value here.

Build 🔧: packages/opentelemetry-exporter-zipkin/test/common/transform.test.ts#L276

'Span' only refers to a type, but is being used as a value here.

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