Add allowance query options

[gndelia]

Description

This PR exports allowanceQueryOptions so consumers of the package can use allowance from the query cache outside of hooks. No changes in behaviour

Screenshots

N/A

Checklist

• Manual testing passed.
• Automated tests added, or N/A.
• Documentation updated, or N/A.
• Environment variables set in CI, or N/A.

[Copilot]

Pull request overview

This PR exposes a reusable allowanceQueryOptions helper so consumers can construct React Query options/keys for ERC20 allowance queries and interact with the query cache outside of the useAllowance hook.

Changes:

• Added allowanceQueryOptions (built via queryOptions) and refactored useAllowance to use it.
• Adjusted React Query imports/types to support the new options helper.
• Bumped package version to 1.4.0.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/useAllowance.ts	Introduces and exports allowanceQueryOptions, and refactors useAllowance to consume it.
package.json	Version bump to publish the new exported API.

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