Expose span_id in Span constructor

[sl0thentr0py]

No description provided.

[codecov-commenter]

Codecov Report

Base: 98.33% // Head: 96.56% // Decreases project coverage by -1.76%⚠️

Coverage data is based on head (954d6a2) compared to base (248ad25).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@ Coverage Diff @@## neel/config-instrumenter #1945 +/- ##
============================================================
- Coverage 98.33% 96.56% -1.77% 
============================================================
Files 151 121 -30 Lines 9369 7723 -1646 ============================================================
- Hits 9213 7458 -1755 - Misses 156 265 +109 

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/span.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/span_spec.rb	100.00% <100.00%> (ø)
sentry-rails/lib/sentry/rails/railtie.rb	25.33% <0.00%> (-72.00%)	⬇️
sentry-rails/lib/sentry/rails/tracing.rb	34.21% <0.00%> (-65.79%)	⬇️
...entry-rails/lib/sentry/rails/capture_exceptions.rb	34.61% <0.00%> (-65.39%)	⬇️
sentry-rails/lib/sentry/rails/active_job.rb	39.47% <0.00%> (-60.53%)	⬇️
sentry-rails/lib/sentry/rails/backtrace_cleaner.rb	47.05% <0.00%> (-52.95%)	⬇️
.../lib/sentry/rails/rescued_exception_interceptor.rb	50.00% <0.00%> (-50.00%)	⬇️
...ntry/rails/tracing/action_controller_subscriber.rb	55.55% <0.00%> (-44.45%)	⬇️
...ls/lib/sentry/rails/tracing/abstract_subscriber.rb	37.03% <0.00%> (-37.04%)	⬇️
... and 36 more

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[st0012]

I feel this can be based on master?