chore: update network driver dependency

[ken-schneider]

Updates the datadog-agent/pkg/network/driver dependency which is needed to allow the original commit in the agent repo to be merged.

Once this is done, we should follow with a new version update in this repo to get us back to the main release track.

Also, I forgot to put the README updates in a separate branch. Assuming this doesn't get backed out, it's fine

[Copilot]

Pull request overview

Updates the traceroute project to consume a newer datadog-agent/pkg/network/driver module revision (required for an upstream agent change), and adjusts Windows driver I/O control usage to match the updated dependency API. It also expands the top-level README with build/run/testing instructions to make the project easier to use locally.

Changes:

• Bump github.com/DataDog/datadog-agent/pkg/network/driver to v0.81.0-devel... and refresh related Go module dependencies.
• Update the Windows packet driver source to call SynchronousDeviceIoControl when installing data filters.
• Add “Getting Started” documentation including build targets, CLI/server usage examples, and flag reference.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
readme.md	Adds getting-started/build/usage/testing documentation and updates section heading near downstream usage.
packets/driver_source_windows.go	Switches driver IOCTL call to the updated synchronous API for setting filters.
go.mod	Updates the driver dependency version and refreshes several related module versions.
go.sum	Records new module checksums corresponding to the dependency updates.

Comments suppressed due to low confidence (1)

packets/driver_source_windows.go:92

• The error returned from SynchronousDeviceIoControl is currently formatted with %v, which discards error wrapping and makes it harder for callers to inspect/root-cause the underlying failure. Elsewhere in this file you consistently wrap errors with %w (e.g., setupSourceDriver).

		err := d.handle.SynchronousDeviceIoControl(
			driver.SetDataFilterIOCTL,
			(*byte)(unsafe.Pointer(&filter)),
			uint32(unsafe.Sizeof(filter)),
			(*byte)(unsafe.Pointer(&id)),
			uint32(unsafe.Sizeof(id)), nil, nil)
		if err != nil {
			return fmt.Errorf("failed to set filter: %v", err)
		}

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