feat(metrics): Add validator metrics for cpu model and system memory (#4666)

[nmrshll]

Description of change

Introduces enhancements to the validator metrics by adding support for getting validator hardware specs, like CPU model/cores, system memory, disk space. This data is sent to iota-proxy (for us to monitor the state of the network through telemetry).

Also fixes private network setup scripts/configs, which didn't seem to work with the exact commands given in the different READMEs (I encountered the same problems as described in #5204, had to fix them to test this PR with docker)

Added example grafana dashboard items:

Links to any relevant issues

Fixes #4666.

Platform support:

• Linux / MacOS, arm64/x86
• ⚠️ Unfortunately, for docker on MacOS (and same for Orbstack and podman-machine), the stats gathered cannot be reliable (at least without complicating this PR and the docker setup): cpu model usually missing, disk space shows any value provided by the docker virtual machine
• on docker on Linux (which is what most people running our default node setup will likely run), the stats are gathered correctly

Type of change

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

The changes have been tested in a local environment to ensure that the new metrics are being collected correctly and that the private network setup works seamlessly with Grafana. Further testing will be conducted based on feedback received.

Change checklist

• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

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[muXxer]

I pushed some fixes. Now the metrics also work when run via iota-swarm.

Please also implement the following changes:

• all other disks than "db_disk" should also have a disk spec including their total_bytes in the description.
• the value of "disk spec"'s can be set to 0, same for hw_memory_specs
• maybe rename db_disk_name and db_disk_total_bytes, remove the db_disk prefix (this way you can reuse the same schema for all disc specs)