adding cpu and memory metrics

[thugrock7]

Description

Adding CPU and Memory monitoring metrics

Testing

deployed and tested locally.

Checklist:

• My changes generate no new warnings

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[varkey98]

Pls wait for a review from @tim-mwangi as well

[codecov]

Codecov Report

Attention: Patch coverage is 70.17544% with 17 lines in your changes missing coverage. Please review.

Project coverage is 59.45%. Comparing base (4e0c822) to head (beb9f7f).

Files	Patch %	Lines
...n/opentelemetry/internal/metrics/system_metrics.go	69.64%	10 Missing and 7 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
- Coverage   60.40%   59.45%   -0.95%     
==========================================
  Files          55       70      +15     
  Lines        1836     2348     +512     
==========================================
+ Hits         1109     1396     +287     
- Misses        659      867     +208     
- Partials       68       85      +17     

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[tim-mwangi]

Strange that we do not get the reason for static analysis failure.

[tim-mwangi]

Let's make this configurable since in some deployments such as full TPA and ebpf, we already capture this. i.e can be disabled/enabled. We can add a system_metrics_enabled flag here https://github.com/hypertrace/agent-config/blob/1259231da9069021d09bcb6f3393275be0372582/proto/hypertrace/agent/config/v1/config.proto#L191

[varkey98]

@ryanericson @thugrock7 merging this as we discussed yesterday during standup call