fix: rename otel timestamp attribute

[sylr]

This attribute is standardize and setting it with a string messes with signoz.

[coderabbitai]

Walkthrough

The pull request updates tracing in the transaction storage insertion: attribute keys were renamed to a namespaced form and a new transaction.reference attribute was added; imports were reorganized with no behavioral change.

Changes

Cohort / File(s)	Summary
Transaction tracing & imports internal/storage/ledger/transactions.go	In InsertTransaction tracing callback: renamed id → transaction.id and timestamp → transaction.timestamp; added transaction.reference set to tx.Reference. Imports were regrouped (no semantic change).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐇 I nibble bytes and trace the flow,
Transaction keys now tidy — watch them glow,
A new little reference hops into sight,
Logs shine clearer in the moonlight. ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: rename otel timestamp attribute' directly describes the main change - renaming an OpenTelemetry timestamp attribute from 'timestamp' to 'transaction.timestamp' as shown in the summary.
Description check	✅ Passed	The description explains the context and rationale for the change - that the attribute is standardized and using a string caused issues with SigNoz, which aligns with the code changes made to rename the otel attribute.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch hotfix/v2.3/fix-otel-attribute

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.78%. Comparing base (42bbfb5) to head (d6e5753).

Additional details and impacted files

@@              Coverage Diff              @@
##           release/v2.3    #1247   +/-   ##
=============================================
  Coverage         81.78%   81.78%           
=============================================
  Files               187      187           
  Lines              9059     9060    +1     
=============================================
+ Hits               7409     7410    +1     
+ Misses             1215     1212    -3     
- Partials            435      438    +3     

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