Rename firebase FetchException to FirebaseConfigException

[kirich1409]

Summary

Renames the firebase provider's FetchException → FirebaseConfigException (closes #289).

Since #163, the exception wraps failures from both fetch() and initialize() (the latter calls ensureInitialized(), not a fetch), so the fetch-specific name no longer fits. The new name matches FirebaseConfigValueProvider and is operation-agnostic.

Changes (firebase module only)

• FetchException.kt → FirebaseConfigException.kt (git mv, history preserved); class renamed.
• Class KDoc generalized: "Thrown when a Firebase Remote Config operation fails" — now covers initialize() and fetch().
• Both throw sites + @throws / […] KDoc references in FirebaseConfigValueProvider.kt updated.
• Test references and method names updated.

Pure rename — no behavioral change. ast-index usages "FetchException" returns empty.

Breaking change

FetchException is public API of the firebase provider. Per project policy (no migration window) the rename goes in directly; the version number reflects it.

:providers:firebase:compileDebugKotlin + testDebugUnitTest green; spotless clean.

🤖 Generated with Claude Code

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