Memory Leak on Navigation due to references not being removed from the HashMap

使用 @nativescript/template-drawer-navigation 复现泄漏，然后检查 issue 中描述的 Android Studio 堆转储和 LeakCanary 引用。跟踪导航过程中被 HashMap 保留的 FragmentClass 实例，并验证已清除或替换的页面可以在不保留旧 fragment 的情况下被垃圾回收。

Environment

• CLI: 8.0.2
• Cross-platform modules:
• Android Runtime: 8.0.0
• iOS Runtime (if applicable):
• Plugin(s):

Describe the bug
When navigating the old fragments are still being referenced in the HashMap so the Garbage Collector doesn't collect them causing a memory leak.

When the navigation's 'clearHistory: true' the backstack is emptied properly but the memory leak remains.
When 'clearHistory: false' you can see all the old pages still in the backstack with different Id names even if they are the same page.

To Reproduce
ns create my-drawer-js --template @nativescript/template-drawer-navigation
Open up the profiler in Android Studio
Go to Memory and start a new profiling session
Navigate to a different page in the template app
Go back to profiler and Dump Java Heap

Click the Leaks link

Click the FragmentClass

Click the Instance

Click the References Tab and check the 'Show nearest GC root only' Option

The FragmentClass instance can't be released because of the references in the HashMap I believe.

This leak is also caught using leak canary

Expected behavior
Fragments should be getting completely removed from memory

Sample project
I used the most vanilla template I could to make sure issues weren't coming from frameworks or plugins
https://www.npmjs.com/package/@nativescript/template-drawer-navigation

Additional context