Refactor mm-snap init command

[GuillaumeRx]

Refactor mm-snap init command to fetch template from https://github.com/MetaMask/template-snap-monorepo. This also simplifies the init logic.

Fixes #803
Fixes #734

[socket-security]

Socket Security Pull Request Report

👍 No new dependency issues detected in pull request

Pull request report summary

Issue	Status
Install scripts	✅ 0 issues
Native code	✅ 0 issues
Bin script confusion	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Non-existent author	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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[FrederikBolding]

@GuillaumeRx This needs a rebase since another PR was just merged that changed package.json

[FrederikBolding]

@GuillaumeRx Please write a PR description that explains what this PR does.

[FrederikBolding]

Something in the PR is broken, it creates infinite node processes

stale

[FrederikBolding]

🔥