[breaking] Upgrade to dd-trace-js version 3.x

[astuyve]

What does this PR do?

Breaking change which upgrades this library to dd-trace-js v3.x

Motivation

Bug fixes, performance improvements, etc. All detailed here in the migration guide

Testing Guidelines

We've been running this in our self-monitoring application for ~4 days successfully.

I've also deployed a test service which verifies tracing managed services, cold start tracing, and trace propagation is all working:

Additional Notes

When we release this, we'll need to update our documentation regarding node12 support.

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)

[codecov-commenter]

Codecov Report

Merging #375 (92b9b31) into main (def89b9) will not change coverage.
The diff coverage is n/a.

❗ Current head 92b9b31 differs from pull request most recent head 6f09dc6. Consider uploading reports for the commit 6f09dc6 to get more accurate results

@@           Coverage Diff           @@
##             main     #375   +/-   ##
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  Coverage   80.89%   80.89%           
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  Files          38       38           
  Lines        1931     1931           
  Branches      448      448           
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  Hits         1562     1562           
  Misses        313      313           
  Partials       56       56           

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[joeyzhao2018]

LGTM