Add tracing to model provider and embedding provider

[MohamedSabthar]

Purpose

Related to: ballerina-platform/ballerina-library#8341

Examples

Checklist

• Linked to an issue
• Test with Jaeger

[codecov]

Codecov Report

❌ Patch coverage is 46.03175% with 68 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.63%. Comparing base (32d6f50) to head (771ca57).
⚠️ Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
ballerina/model-provider.bal	2.12%	46 Missing ⚠️
ballerina/embedding_provider.bal	54.54%	15 Missing ⚠️
ballerina/provider_utils.bal	84.78%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   28.22%   29.63%   +1.40%     
==========================================
  Files           5        5              
  Lines         751      847      +96     
  Branches      228      250      +22     
==========================================
+ Hits          212      251      +39     
- Misses        539      596      +57     

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