ddtrace/opentelemetry: added support for special attributes mapping

[dianashevchenko]

What does this PR do?

This PR adds support special span attributes, to match OTLP behavior.
Specifically, name, service, resource, type and analytics.event.

For example:

• if service.name attribute is set on the span, it will be remapped to Datadog's service tag.
• if analytics.event attribute is set on the span, it will be remapped to Datadog's _dd1.sr.eausr tag.

Motivation

Matching OTLP support behaviour.

Reviewer's Checklist

• Changed code has unit tests for its functionality at or near 100% coverage.
• There is a benchmark for any new code, or changes to existing code.
• If this interacts with the agent in a new way, a system test has been added.

For Datadog employees:

• If this PR touches code that handles credentials of any kind, such as Datadog API keys, I've requested a review from @DataDog/security-design-and-guidance.
• This PR doesn't touch any of that.

Unsure? Have a question? Request a review!

[github-actions]

🚫 [golangci] _{reported by reviewdog 🐶}
File is not gci-ed with --skip-generated -s standard,prefix(gopkg.in/DataDog/dd-trace-go.v1),default (gci)

[darccio]

@dianashevchenko Do you need to update the system tests? If you want, I can take care of them. Your PR looks good.

[pr-commenter]

Benchmarks

Benchmark execution time: 2023-11-06 15:46:39

Comparing candidate commit c6c6d13 in PR branch shevchenko/reserved-attributes with baseline commit 6ec6751 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 40 metrics, 1 unstable metrics.