Heartbeat Rework + Mini Tool

[hugeBlack]

• Rework heartbeat related codes so all JITEnableContext methods ensures heartbeat recently happened or restart heartbeat before proceeding.
• Add a 5s limit to heartbeat initialization so it times out quickly instead of waiting for tokio to time out (which takes around 60s)
• Move mounting related codes inside JITEnableContext to avoid race conditions between heartbeat and mount status check.
• Fix a typo in ProfileView.swift
• Add a new feature called "stiktool" (WIP)

Implement a "Mini Tool" feature in this project. The mini tool feature allows users to import ".stiktool" bundles into current app.
The stiktool bundle contains 2 files: index.html and background.js.
The index.html works as a UI of the mini tool and is displayed inside a WKWebView.
The background.js works as the backend of the mini tool and runs inside JavaScriptCore.
They both can send messages to each other through a provided api.
Write a tool list view which displays all available mini tools inside Documents/tools. User can launch an app from the view and the related stiktool should be loaded. See JSSupport/ScriptListView.swift for style reference. Users shoule be able to view and edit the code of the stiktool bundle.

[StephenDev0]

Let me know when this is ready to merge

[StephenDev0]

And thanks for fixing my mess