feat: instrumenting vss store with tracing

[enigbe]

What this PR does

WIP: Implements distributed tracing between ldk-node and vss-server to enable end-to-end observability across service boundaries.

• Propagates trace context from ldk-node to vss-server for all VssStore client operations.
• Enables correlation of requests across both services in a single trace view

Current instrumentation coverage

• VssStore operations
• Bolt11Payment::send flows
  (Additional instrumentation planned if support for optional tracing is green-lit)

Supporting components added

• TracingLogWriter: Logger adapter that bridges existing log_*! macros to tracing events, avoiding the need for repo-wide migration to tracing macros
• Jaeger Integration: Configured export pipeline for trace visualization and analysis

Motivated by debugging challenges when reviewing the addition of InMemoryBackendImpl to vss-server.