Add anonymousId and timestamp to web signalData

[silesky]

Support:

{
 type: '...', // e.g. 'interaction'
 timestamp: '2025-03-18T20:27:01.459Z', // added
 anonymousId: '12345' // added
 data: { ... }
}

[changeset-bot]

🦋 Changeset detected

Latest commit: 637b309

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@segment/analytics-signals	Minor
@segment/analytics-signals-runtime	Minor

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Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

Attention: Patch coverage is 61.90476% with 8 lines in your changes missing coverage. Please review.

Project coverage is 83.79%. Comparing base (83c25bb) to head (07aefe2).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...als/signals/src/core/middleware/user-info/index.ts	16.66%	5 Missing ⚠️
...kages/signals/signals/src/plugin/signals-plugin.ts	50.00%	2 Missing ⚠️
...ckages/signals/signals/src/core/signals/signals.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1263      +/-   ##
==========================================
- Coverage   83.86%   83.79%   -0.08%     
==========================================
  Files         221      222       +1     
  Lines        5877     5888      +11     
  Branches     1344     1344              
==========================================
+ Hits         4929     4934       +5     
- Misses        948      954       +6     

Flag	Coverage Δ
browser	92.27% <ø> (ø)
core	89.86% <ø> (ø)
node	87.93% <ø> (ø)

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