Force encode request body if it's a string

[st0012]

Fixes #1475 and #1303

[codecov-commenter]

Codecov Report

Merging #1484 (4aa09ba) into master (d82b463) will increase coverage by 0.55%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1484      +/-   ##
==========================================
+ Coverage   98.20%   98.76%   +0.55%     
==========================================
  Files         218      123      -95     
  Lines       10461     6627    -3834     
==========================================
- Hits        10273     6545    -3728     
+ Misses        188       82     -106     

Impacted Files	Coverage Δ
sentry-ruby/lib/sentry/interfaces/request.rb	94.82% <100.00%> (+0.09%)	⬆️
...y/spec/sentry/interfaces/request_interface_spec.rb	99.14% <100.00%> (+0.03%)	⬆️
sentry-rails/lib/sentry/rails/active_job.rb	97.05% <0.00%> (-0.09%)	⬇️
sentry-rails/lib/sentry/rails/configuration.rb	100.00% <0.00%> (ø)
...-sidekiq/spec/sentry/sidekiq/error_handler_spec.rb	100.00% <0.00%> (ø)
sentry-raven/spec/raven/raven_spec.rb
...raven/spec/raven/breadcrumbs/sentry_logger_spec.rb
sentry-raven/spec/raven/configuration_spec.rb
...ntry-raven/spec/raven/processors/post_data_spec.rb
sentry-raven/lib/raven/processor/cookies.rb
... and 90 more

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