feat(devservices): Add tracing mode

[hubertdeng123]

This adds mode for all things tracing. This encompasses transactions/metrics/spans.

Taken from

sentry/src/sentry/runner/commands/devserver.py

Line 370 in feeaf39

if settings.SENTRY_USE_SPANS_BUFFER:

[codecov]

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Additional details and impacted files

@@             Coverage Diff             @@
##           master   #93759       +/-   ##
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+ Coverage   53.06%   88.07%   +35.00%     
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  Files       10334    10336        +2     
  Lines      596995   596699      -296     
  Branches    23222    23092      -130     
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+ Hits       316824   525543   +208719     
+ Misses     279667    70700   -208967     
+ Partials      504      456       -48     

[shruthilayaj]

minor comments, but otherwise LGTM

[phacops]

We should run the item versions of the consumers instead, not the spans ones.

[phacops]

What @shruthilayaj says, but with subscription-results-eap-items.

[hubertdeng123]

We should run the item versions of the consumers instead, not the spans ones.

@phacops What does this mean? I added subscription-results-eap-items, is that what you're referring to?

[phacops]

@phacops What does this mean? I added subscription-results-eap-items, is that what you're referring to?

Yes.

[hubertdeng123]

@phacops @shruthilayaj I've changed this mode from spans to tracing to encompass transactions, spans, and metrics now since I've heard feedback that it might be more useful this way. Could you double check to see if I'm missing anything?

Addressed comments, can follow up if necessary after merging