ADFA-5500: Keep the app libraries the layout editor plugin still loses to R8

The GlitchTip issue (CODEONTHEGO-F2, and F3/F4/G4/GQ with the same
cause) is a layout editor view failing to inflate in release builds:
NoSuchMethodException on NavigationRailView(Context, AttributeSet),
then the "Missing required view" NPE from the plugin's view binding.
Plugins load parent-first, so they get the app's shrunk copy of a
library it shares with them. ADFA-5731 (#1830) fixed that class by
keeping com.google.android.material whole; all 178 events come from
releases built before it.

The same failure is still on stage for other shared libraries. Checking
layout-editor.cgp's references against the stage release dex, and
against an unshrunk debug dex to rule out version skew, finds members
R8 strips that the plugin reaches:

- sora CodeEditor(Context, AttributeSet), inflated by the Show XML
  screen: the same inflation failure and NPE as this issue
- CardView(Context) and ViewPager(Context), constructed by the
  CardView and ViewPager palette items: NoSuchMethodError
- 14 sora members (Span.setExtra, Logger, ...) called by the plugin's
  bundled TextMate highlighter: NoSuchMethodError

Keep io.github.rosemoe.sora, androidx.cardview and
androidx.viewpager.widget whole, like the other shared libraries.

Author: Daniel-ADFA

app/proguard-rules.pro

@@ -257,6 +257,9 @@
 -keep class io.noties.markwon.** { *; }
 -keep class com.google.gson.** { *; }
 -keep class org.snakeyaml.engine.** { *; }
+-keep class io.github.rosemoe.sora.** { *; }
+-keep class androidx.cardview.** { *; }
+-keep class androidx.viewpager.widget.** { *; }
 
 -keep class com.google.firebase.** { *; }
 -keep class com.google.android.gms.** { *; }