Update trace exporter to include trace state and drop counts

[blakeroberts-wk]

Which problem is this PR solving?

The exporter does not include:

• trace state on the span
• dropped span attributes count
• dropped span links count
• dropped link attributes count

Fixes N/A

Short description of the change

The exporter will export:

• trace state on the span
• dropped span attributes count
• dropped span links count
• dropped link attributes count

How Has This Been Tested?

Pulled changes into a deployed app and spans were successfully exported and retrieved from a trace backend.

Checklist:

• Unit tests have been added
• Documentation has been updated

[aviary2-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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Questions or Comments? Reach out on Slack: #support-infosec.

[blakeroberts-wk]

QA +1 deployed changes to web app and successfully exported and retrieved spans from backend.

[blakeroberts-wk]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM