create middlware to add the client ip address to datadog tracing

[wendelfabianchinsamy]

Purpose

closes: #1217

Approach

Open Questions and Pre-Merge TODOs

Learning

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

Reviewer, please remember our guidelines:

• Be humble in the language and feedback you give, ask don't tell.
• Consider using positive language as opposed to neutral when offering feedback. This is to avoid the negative bias that can occur with neutral language appearing negative.
• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
• Ensure you give reasons for the changes you are proposing.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Elasticsearch::Transport::Transport::Errors::BadRequest: [400] {"error":{"root_cause":[{"type":"token_mgr_error","reason":"token_mgr_error: Lexical error ... GraphqlController#execute View Issue
• ‼️ Elasticsearch::Transport::Transport::Errors::BadRequest: [400] {"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Result window is too... GraphqlController#execute View Issue
• ‼️ Elasticsearch::Transport::Transport::Errors::BadRequest: [400] {"error":{"root_cause":[{"type":"token_mgr_error","reason":"token_mgr_error: Lexical error ... GraphqlController#execute View Issue
• ‼️ TypeError: no implicit conversion of Integer into String GraphqlController#execute View Issue
• ‼️ **NoMethodError: undefined method buckets' for nil:NilClass** DataciteDoisController#index` View Issue

_{Did you find this useful? React with a 👍 or 👎}