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feat: Support custom and async local storage serializers - fixes #3 (#30)

* feat: Support custom and async local storage serializers

Introduces the `Serializer` interface and allows passing a custom
serializer via hook options. This enables users to define custom
logic for transforming data before storage and after retrieval.

The primary use case is encrypting data or handling non-JSON
compatible objects. The implementation supports both synchronous
and asynchronous serialization/deserialization methods.

The default JSON serialization is now handled by the internal
`JsonSerializer`.

Includes documentation updates and refactors tests to handle
asynchronous serialization.

* Update src/useLocalStorageSerializer.spec.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Restore deleted tests

* Restore deleted tests

* Restore more deleted test cases

* Restore more deleted test cases

* Restore more deleted test cases

* Fix tests

* refactor: Reuse logic for reading storage value

Extracted the asynchronous read logic into a dedicated function,
`readValueFromStorage`.

This removes duplicated read and error handling logic between
the initial mount of the hook and the debounced storage change
listener.

Also applied minor formatting changes to `setValue`.

* Urgh..

* Ooof

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

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