Add limit for internal span capture

[fractalwrench]

Goal

Adds a limit of 1000 for the number of internal spans that we capture. I'm open to discussion on the exact limit we enforce, but noticed during my validation of this migration that the number of internal spans was unbounded.

Technically we should always bound the number of spans in the DataSource implementation, but in practice I'd like to add this as a backstop to prevent the payload from getting overloaded.

Testing

Added unit tests.

[bidetofevil]

I think we should bump this limit - network requests will easily push past this, and we allow 1000 per session per domain, IIRC. I'd go 3000 to start off with, and maybe look at existing data to inform this limit?

[fractalwrench]

Good point. I bumped this to 5000 & we can adjust from there. Really it's just a backstop to avoid stupid amounts of spans getting logged & in practice I don't think this will be reached for the vast majority of payloads

[bidetofevil]

LGTM. We may want to bump the limit though because network requests will blow past this easily

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.78%. Comparing base (b405fcd) to head (2fecce9).

Additional details and impacted files

@@                    Coverage Diff                    @@
##           integration/v2-migration     #974   +/-   ##
=========================================================
  Coverage                     79.78%   79.78%           
=========================================================
  Files                           406      406           
  Lines                         10798    10804    +6     
  Branches                       1715     1716    +1     
=========================================================
+ Hits                           8615     8620    +5     
  Misses                         1406     1406           
- Partials                        777      778    +1     

Files	Coverage Δ
...droid/embracesdk/internal/spans/SpanServiceImpl.kt	85.45% <ø> (ø)
...mbracesdk/internal/spans/CurrentSessionSpanImpl.kt	84.21% <85.71%> (+0.87%)	⬆️

... and 2 files with indirect coverage changes