on_error settings for grape

[TonyCTHsu]

2.0 Upgrade Guide notes

🚨 Breaking change for Grape instrumentation:

Replace error_statuses with error_status_codes. Change your configuration from string to array of ranges or integers.

For example:

Before:

Datadog.configure do |c|
  c.tracing.instrument :grape, error_statuses: '400,500-599'
end

After:

Datadog.configure do |c|
  c.tracing.instrument :grape, error_status_codes: [400, 500..599]
end

What does this PR do?

1. Add on_error settings for grape instrumentation
2. Replace error_statuses with error_status_codes settings for grape instrumentation

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6ea3035) 98.10% compared to head (6ea3035) 98.10%.

❗ Current head 6ea3035 differs from pull request most recent head a7405cd. Consider uploading reports for the commit a7405cd to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              2.0    #3370   +/-   ##
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  Coverage   98.10%   98.10%           
=======================================
  Files        1250     1250           
  Lines       72377    72377           
  Branches     3394     3394           
=======================================
  Hits        71009    71009           
  Misses       1368     1368           

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[brett0000FF]

Small style nits changing to present tense, avoiding temporal words, and fixing spacing before parenthetical. 👍