Adds span.kind with values producer and consumer for delayed_job

[zarirhamza]

What does this PR do?

Adds span.kind tag for certain spans in delayed_job

Refer to Opentelemetry for definitions of producer and consumer

The instrument_invoke method has been tagged with consumer for span.kind
The instrument_enqueue method has been tagged with producer for span.kind

[codecov-commenter]

Codecov Report

Merging #2393 (d1e7021) into master (a6a1bc5) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head d1e7021 differs from pull request most recent head a8aebd6. Consider uploading reports for the commit a8aebd6 to get more accurate results

@@            Coverage Diff             @@
##           master    #2393      +/-   ##
==========================================
- Coverage   98.35%   98.35%   -0.01%     
==========================================
  Files        1102     1102              
  Lines       59374    59389      +15     
==========================================
+ Hits        58397    58411      +14     
- Misses        977      978       +1     

Impacted Files	Coverage Δ
...b/datadog/tracing/contrib/redis/instrumentation.rb	100.00% <100.00%> (ø)
...adog/tracing/contrib/redis/instrumentation_spec.rb	100.00% <100.00%> (ø)
spec/datadog/tracing/contrib/redis/miniapp_spec.rb	100.00% <100.00%> (ø)
spec/datadog/tracing/contrib/redis/redis_spec.rb	99.53% <100.00%> (+0.02%)	⬆️
spec/support/http_helpers.rb	90.90% <0.00%> (-9.10%)	⬇️
lib/datadog/core/diagnostics/environment_logger.rb	98.42% <0.00%> (-1.58%)	⬇️
...adog/tracing/contrib/sidekiq/server_tracer_spec.rb	100.00% <0.00%> (+0.83%)	⬆️
...adog/tracing/contrib/sidekiq/client_tracer_spec.rb	100.00% <0.00%> (+2.08%)	⬆️

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[TonyCTHsu]

LGTM!