[Feature]: SimpleSpanProcessor to be consistent with SimpleLogRecordProcessor about opentelemetry-rust HOT 4 OPEN

One of the concerns I believe was users needing performance in hot-path without depending on the external runtime. This should be resolved with #1506.

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This may simplify things, but we should check the overall throughput to make sure it's still acceptable given our performance focus (e.g. if an exporter has an average latency of ~1 second)

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I don't think the perf would be good here (and will directly be affected by how slow the exporter is!). For performance scenarios - there is BatchProcessors to the rescue, so my main point was - we should not worry about perf for SimpleProcessor, which should only be used for testing/learning purposes!

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Any further comments/objections to do this?

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