What does this PR do?

Change the lambda span service name priority:

1. value of DD_SERVICE
2. value of lambda function name
3. aws.lambda

Also changes cold_start values to true/false

Adds DD_TRACE_AWS_SERVICE_REPRESENTATION_ENABLED to allow disabling of feature when set to false. Default is true.

Motivation

Removes service overrides for aws.lambda span

Testing Guidelines

Additional Notes

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
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• This PR passes the integration tests (ask a Datadog member to run the tests)