Add tracing functionality to Merino

[mtbottle]

This is a proof of concept and currently exports the traces to console. We will need to do more work to hook it up for other environments (i.e. set up environment variables and other configurations).

References

JIRA: DISCO-TODO

Description

PR Review Checklist

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• This PR conforms to the Contribution Guidelines
• The PR title starts with the JIRA issue reference, format [DISCO-####], and has the same title (if applicable)
• [load test: (abort|warn)] keywords are applied (if applicable)
• Documentation has been updated (if applicable)
• Functional and performance test coverage has been expanded and maintained (if applicable)