Add keyed defaultComponentContext for parallel Android roots

[Codex]

defaultComponentContext lacked a way to scope state/retained instances when creating multiple contexts in the same Activity/Fragment.

• API: Added optional key to Activity/Fragment defaultComponentContext overloads; API surface updated.
• Behavior: Keyed state keepers and per-key InstanceKeeperDispatcher to avoid collisions; preserves old behavior when key is null.
• Docs: Clarified single-call guidance now except when using unique keys.
• Tests: Added Android unit tests covering per-key state/instance isolation and discard semantics.

Example:

// Two independent contexts on the same host
val primary = defaultComponentContext(key = "primary")
val secondary = defaultComponentContext(key = "secondary", discardSavedState = true)

Warning

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add key parameter to defaultComponentContext function</issue_title>
<issue_description>Similarly to retainedComponentContext.</issue_description>

Comments on the Issue (you are @codex[agent] in this section)

• Fixes Add key parameter to defaultComponentContext function #989

[arkivanov]

This breaks the binary compatibility. We'd need a new overload.