Add more constraints for playing episode caching

[ashiagr]

Description

This disables playing episode caching if

• it is downloading
• storage is less

Testing Instructions

1. Delete cache directory if it exists at /data/data/au.com.shiftyjelly.pocketcasts.debug/cache/pocketcasts-exoplayer-cache
2. Open a podcast and long-press an episode
3. Tap download from the top bar (multi-select) menu
4. Play the episode
5. ✅ Notice that the episode is not cached in Device Explorer at /data/data/au.com.shiftyjelly.pocketcasts.debug/cache/pocketcasts-exoplayer-cache
6. Smoke test that episode can be cast properly

Checklist

• [ ] If this is a user-facing change, I have added an entry in CHANGELOG.md
• [x] Ensure the linter passes (./gradlew spotlessApply to automatically apply formatting/linting)
• [ ] I have considered whether it makes sense to add tests for my changes
• [ ] All strings that need to be localized are in modules/services/localization/src/main/res/values/strings.xml
• [ ] Any jetpack compose components I added or changed are covered by compose previews
• [ ] I have updated (or requested that someone edit) the spreadsheet to reflect any new or changed analytics.

I have tested any UI changes...

• [ ] with different themes
• [ ] with a landscape orientation
• [ ] with the device set to have a large display and font size
• [ ] for accessibility with TalkBack

[ashiagr]

Closing it in favor of https://github.com/Automattic/pocket-casts-android/pull/2443