fix(types): make getEntries return unknown instead of generic T

[Sushil-19]

Summary

Fixes the incorrect typing of getEntries().

The previous signature exposed a generic <T>, which implied that all returned entries share the same type. Since the storage can contain heterogeneous values (sessions, pairings, metadata, etc.), this assumption is not guaranteed and therefore unsound.

Background

getEntries<T>() suggests that consumers can safely expect every stored value to conform to T. However, the underlying storage layer is type-agnostic and may return different object shapes depending on what was persisted.

This mismatch between the type contract and runtime behavior can lead to incorrect assumptions or unsafe downstream usage.

Changes

• Removed the generic parameter from getEntries
• Updated return type to:
  Promise<[string, unknown][]>
• Removed unsafe casts (as [string, T]) in implementations
• No runtime behavior changes

Scope

This PR strictly corrects the type definition to reflect actual storage behavior.
No changes were made to persistence logic, session handling, or storage flow.

All existing behavior remains unchanged.

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[Sushil-19]

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