Add WithDisableTopology option to reduce memory consumption

[halfcrazy]

This commit adds a new WithDisableTopology() option that allows users to skip system topology detection when calling ghw.PCI() or ghw.GPU(), significantly reducing memory consumption for use cases that don't require NUMA topology information.

Performance impact on real production servers:

Dual-socket server (2 NUMA nodes, 96 cores):
BenchmarkPCIMemoryComparison/WithTopologyDetection 100 100708875 ns/op 29332384 B/op 289365 allocs/op
BenchmarkPCIMemoryComparison/WithDisableTopology 100 58473485 ns/op 17201283 B/op 247006 allocs/op

• Memory: 41% reduction (28 MB -> 16.4 MB)
• Time: 42% faster (100.7 ms -> 58.5 ms)
• Allocations: 15% fewer (289,365 -> 247,006)

Quad-socket server (4 NUMA nodes, 128 cores):
BenchmarkPCIMemoryComparison/WithTopologyDetection 100 448132406 ns/op 344566098 B/op 257009 allocs/op
BenchmarkPCIMemoryComparison/WithDisableTopology 100 64284435 ns/op 18707107 B/op 193877 allocs/op

• Memory: 94.6% reduction (328 MB -> 17.8 MB)
• Time: 85.7% faster (448 ms -> 64 ms)
• Allocations: 24.6% fewer (257,009 -> 193,877)
• Saves 310 MB per call - critical for large deployments

[halfcrazy]

xref #354

[jaypipes]

Hi @halfcrazy sorry this has lagged. I will have to rework this PR due to a refactoring that recently merged as we head towards a 1.0 release of ghw. I will try to get to the reworking of this PR this weekend.

[halfcrazy]

I found options.PCIDB no longer used, i'm not sure if this is expected.

[jaypipes]

Author

@halfcrazy yes, we've totally changed the way that options and context are handled. I will rework this PR soon, I promise. sorry for the delay.

[jaypipes]

@halfcrazy sorry it took so long, but I rebased and fixed up your commit to use the latest config/context handling:

#449

[halfcrazy]

@halfcrazy sorry it took so long, but I rebased and fixed up your commit to use the latest config/context handling:

#449

thank you