Replace heim with sysinfo [ fix build on FreeBSD ]

[yonas]

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Problem

Replacing heim with sysinfo will fix building on FreeBSD.

Configuration

No response

Version

0.37.1

Debug Output

No response

Example Data

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Additional Context

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References

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[jszwedko]

As mentioned in #10614 we could also support FreeBSD by disabling the host_metrics source for it. There is already some precedent for platform specific sources (mostly between Linux and Windows). This is likely to be less work than swapping out heim for sysinfo. I think we'd also like to see an RFC comparing the alternatives, and whether sysinfo can satisfy the currently published metrics by the host_metrics source before moving forward with sysinfo.

sysinfo was compared at the time heim was chosen (see https://github.com/vectordotdev/vector/blob/master/rfcs/2020-08-26-3191-host-metrics.md). Granted that was when heim was still maintained and sysinfo lacked FreeBSD support.