[core] Feather Client

[Metrokoto]

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Description

Feather Client has recently been exposed for running advertisements when the user has their computer locked, or has it in the background during gameplay, additionally, they have been engaging in fraudulent advertising practices, hence my intention to include them in AdVoid; Feather Client is for lack of a better term, adware disguised as a Minecraft client.

Related Issue

Fixes https://youtu.be/_Uc1Hys_FrQ

Type of Change

• 🧟‍♂️ Anomaly fix (resolves a broken site caused by AdVoid)
• 🐛 Malformation fix (corrects a malformed filter rule)
• 🐞 Candidate addition (adds a new URL/rule candidate)
• 🚀 Optimization (makes AdVoid more efficient/compact)
• ❌ Removal (removes an outdated/false-positive rule)
• 📖 Documentation update (updates AdVoid's documentation)
• ⚡ Other (please specify in Implementation Notes)

Implementation Notes

Checklist for Reviewer

• Code/rules follow the project's style and contribution guidelines
• No new warnings or errors are introduced
• Changes align with the related issue template (Anomaly, Candidate, etc.)
• This PR correctly references the related issue(s) (Fixes # / Closes #)

[igorskyflyer]

@Metrokoto, I have been monitoring the situation with the given client and still have a decision to make whether to include these rules in AdVoid, hence, I will keep this issue open for some time.

[igorskyflyer]

I have identified a new URL:
https://feathermc.com/ads/

For now, the given URL will get blocked immediately, while we wait for the resolution for core domains.

[igorskyflyer]

LGTM