APM: Add top level support for span events

[ajgajg1134]

What does this PR do?

Motivation

Describe how you validated your changes

Possible Drawbacks / Trade-offs

Additional Notes

[agent-platform-auto-pr]

Uncompressed package size comparison

Comparison with ancestor 70abd234c3950faf793ae73b1276bd6d1dc85c46

Diff per package

package	diff	status	size	ancestor	threshold
datadog-agent-amd64-deb	0.29MB	⚠️	1191.40MB	1191.10MB	140.00MB
datadog-agent-x86_64-rpm	0.29MB	⚠️	1200.71MB	1200.42MB	140.00MB
datadog-agent-x86_64-suse	0.29MB	⚠️	1200.71MB	1200.42MB	140.00MB
datadog-heroku-agent-amd64-deb	0.25MB	⚠️	505.53MB	505.27MB	70.00MB
datadog-agent-arm64-deb	0.25MB	⚠️	935.64MB	935.39MB	140.00MB
datadog-agent-aarch64-rpm	0.25MB	⚠️	944.94MB	944.69MB	140.00MB
datadog-iot-agent-amd64-deb	0.12MB	⚠️	113.47MB	113.35MB	10.00MB
datadog-iot-agent-x86_64-rpm	0.12MB	⚠️	113.54MB	113.42MB	10.00MB
datadog-iot-agent-x86_64-suse	0.12MB	⚠️	113.54MB	113.42MB	10.00MB
datadog-iot-agent-arm64-deb	0.12MB	⚠️	108.94MB	108.81MB	10.00MB
datadog-iot-agent-aarch64-rpm	0.12MB	⚠️	109.00MB	108.88MB	10.00MB
datadog-dogstatsd-amd64-deb	0.00MB	✅	78.57MB	78.57MB	10.00MB
datadog-dogstatsd-x86_64-rpm	0.00MB	✅	78.64MB	78.64MB	10.00MB
datadog-dogstatsd-x86_64-suse	0.00MB	✅	78.64MB	78.64MB	10.00MB
datadog-dogstatsd-arm64-deb	0.00MB	✅	55.77MB	55.77MB	10.00MB

Decision

⚠️ Warning

[agent-platform-auto-pr]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv aws.create-vm --pipeline-id=51846894 --os-family=ubuntu

Note: This applies to commit 11ec8b6