Add process cpu/memory usage to SystemInformationDiagnosticsPlugin

[tjlaxs]

Objective

• Adding process specific cpu/mem usages to SystemInformationDiagnosticsPlugin
• Fixes Add current process cpu/memory usage to SystemInformationDiagnosticsPlugin #18135

Solution

• Adding two new stats by using code provided in Add current process cpu/memory usage to SystemInformationDiagnosticsPlugin #18135

Testing

• Tested by adding SystemInformationDiagnosticsPlugin into enabling_disabling_diagnostics example
• Tested only on Linux (Ubuntu 24.04.2 LTS)

---

Showcase

Example output:

2025-03-12T18:20:45.355206Z INFO bevy diagnostic: fps : 144.139984 (avg 143.968838)
2025-03-12T18:20:45.355229Z INFO bevy diagnostic: system/cpu_usage : 17.299578% (avg 16.410863%)
2025-03-12T18:20:45.355235Z INFO bevy diagnostic: frame_time : 6.939720ms (avg 6.953508ms)
2025-03-12T18:20:45.355239Z INFO bevy diagnostic: frame_count : 1271.000000
2025-03-12T18:20:45.355243Z INFO bevy diagnostic: process/cpu_usage: 172.151901% (avg 165.337555%)
2025-03-12T18:20:45.355247Z INFO bevy diagnostic: process/mem_usage: 400.472656% (avg 400.478516%)
2025-03-12T18:20:45.355250Z INFO bevy diagnostic: system/mem_usage : 34.244571% (avg 34.356289%)

[IceSentry]

This is neat, I didn't realize sysinfo was able to do that. Just a few nitpicks.

I tested this on windows 11 and it works. Although, the values seem a bit off? It gives me values higher than what task manager reports.

[IceSentry]

@tjlaxs can you resolve the conversations so other reviewers don't think there are comments that need to be addressed