Baggage creation for head SDK

[sl0thentr0py]

Creates new Baggage entries when the ruby SDK is the head SDK, i.e the first SDK that originates a distributed trace.
The new Baggage entry is created when get_baggage is first called, either

• when the first outgoing HTTP request is made
• the first transaction finishes and the envelope is sent to sentry

closes #1836

[codecov-commenter]

Codecov Report

Base: 96.67% // Head: 96.72% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (a605ce7) compared to base (8b8af16).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@                        Coverage Diff                        @@
##           neel/baggage-dsc-continuation    #1898      +/-   ##
=================================================================
+ Coverage                          96.67%   96.72%   +0.05%     
=================================================================
  Files                                124      124              
  Lines                               7808     7903      +95     
=================================================================
+ Hits                                7548     7644      +96     
+ Misses                               260      259       -1     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/baggage.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/span.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/transaction.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/transaction_event.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/client_spec.rb	97.25% <100.00%> (+0.01%)	⬆️
sentry-ruby/spec/sentry/net/http_spec.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/transaction_spec.rb	100.00% <100.00%> (ø)
sentry-ruby/spec/sentry/transport_spec.rb	100.00% <100.00%> (ø)
sentry-ruby/lib/sentry/breadcrumb.rb	100.00% <0.00%> (+3.70%)	⬆️

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