refactor(types): replace 'any' types with explicit types in useSubscription.ts

[Ranjeet2063]

Description

This PR refactors type definitions in src/hooks/useSubscription.ts to replace loose any types with explicit and type-safe alternatives:

• deepEqual: Replaced any with unknown with type assertions.
• UseSubscriptionOptions: Typed data parameter generic TData = unknown.
• useSubscription & usePollableSubscription: Replaced any default type parameters with TData = unknown, TVariables extends OperationVariables = OperationVariables.
• Event callback handlers and subscriptions: Added typed ConnectionEvent, typed response payloads, explicit error type narrowing, and typed cleanup references without loose casts.

Closes #1364

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