Implement system uptime and process metrics

[mpetrun5]

[

Implementation details

System Uptime and Process Metrics

Metrics related to the relayer's operational time and host information.

Uptime (sygma_relayer_uptime_seconds):
Description: Total operational time of the relayer.
Type: Counter

Process Start Time (sygma_relayer_process_start_time_seconds):

Description: Start time of the relayer process.
Type: Gauge

Host Name (sygma_relayer_host_name):

Description: The name of the host machine running the relayer.
Type: Gauge with label (e.g., host_name)

Relayer Version (sygma_relayer_version):

Description: The current version of the relayer software.
Type: Gauge with label (e.g., version)

Implement update on startup

Testing details

Check metrics in docker-compose Prometheus

Acceptance Criteria

](https://pkg.go.dev/runtime)

• system metrics exposed through Opentelemetry