icon request: Incognito / Spy Icon (Default, Outline, Filled, Sharp)

### Describe the Icon

Hello Ionicons team 👋

I would like to request a new icon for an “Incognito / Spy” concept.

This icon would be useful for features like:

- Private browsing mode
- Stealth / invisible user mode
- Anonymous activity
- Spy / hidden tracking features (UI representation)

Suggested concept:
A face or figure with disguise elements (hat, glasses, mask, or hidden eyes), or a simplified “anonymous silhouette” style icon that represents privacy and invisibility.

Variants requested:

- Default
- Outline
- Filled
- Sharp

Use cases:

“Incognito mode” toggle in apps
Privacy settings
Hidden/stealth features in social or chat apps
Security tools dashboards

### Links to Examples

_No response_

### Additional Information

_No response_

The issue names no files, tests, or implementation entry points. Start by reviewing the Ionicons contribution and icon design process, then define the visual concept and confirm that default, outline, filled, and sharp variants are produced for the requested incognito or spy use cases.

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