Add serialize attributes for SpanData about opentelemetry-rust HOT 5 CLOSED

@jodh-intel yeah SpanData being serialize/deserialize seems reasonable to me. Want to do the PR? (always good to have more committers 😃)

As far as a release, once the current open PR's land we can likely get a release ready. The current issues around how current span tracking works with futures is the real meat of the outstanding work to be done.

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btw, do you have any thoughts on when you plan to update the crate version (since SpanData isn't available in the latest 0.1.5 release on crates.io)?

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Hi @jodh-intel

We don't have a set date for our next release to crates.io, though it has been a while and there have been a lot of changes since the last release (including moving github org).

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Thanks @MikeGoldsmith - I've tried using the latest git repo version but it got messy due to other deps (and their particular versioned deps) so would be great to be able to consume direct from crates.io ideally.

@jtescher - do you think adding these serialisation options is reasonable?

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Thanks @jtescher - here you go: #59 😄

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