Feat/opentelemetry monitoring

[rahulghangas]

Summary

• Add OpenTelemetry tracing and metrics infrastructure with OTLP gRPC export
• Introduce OTel config, CLI flags, and TOML template for runtime configuration
• Replace legacy cosmos-sdk/telemetry with OpenTelemetry in erc20, feemarket, ibc, precisebank, and vm modules
• Add full monitoring stack (Prometheus, Grafana, Tempo, Loki, OTel Collector) via docker-compose
• Wire OTel flags into local and multi-node startup scripts

Test plan

• Run go build ./... to verify compilation
• Start local node with OTEL_ENABLE=true and verify traces export to collector
• Spin up monitoring stack via docker-compose -f monitoring/docker-compose.yml up
• Confirm Grafana dashboards load and display CometBFT metrics
• Verify module-level counters and gauges appear in Prometheus