Include MultiValueHeaders in DefaultTraceExtractor

[jo-me]

What does this PR do?

This PR merges MultiValueHeader fields with the normal Header fields in the DefaultTraceExtractor

Motivation

current ddlambda tries to read headers from headers while in our case they are passed as multiValueHeaders

Testing Guidelines

local fork

Additional Notes

partly fixes #189 (in combination with PR #201)

Types of changes

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

Checklist

• 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

The program was tested solely for our own use cases, which might differ from yours.

Jochen Mehlhorn [email protected], Mercedes-Benz Tech Innovation GmbH

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