feat(package/gqty): Add isFetching to proxy states

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[Copilot]

Pull request overview

This PR adds an isFetching property to proxy states in the gqty package, enabling real-time tracking of fetch operations for GraphQL queries. The feature uses a reference-counting mechanism with cache keys to track active fetches across nested selections.

Key Changes

• Implemented global fetch tracking using a Map with cache key reference counting
• Added isFetching as a lazy-evaluated getter property on Meta objects
• Integrated fetch lifecycle management in the selection resolution process with proper cleanup

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
packages/gqty/test/isFetching.test.ts	Comprehensive test suite covering concurrent fetches, nested selections, error handling, and edge cases
packages/gqty/src/Selection.ts	Implements global fetch tracking map with increment/decrement functions for cache keys
packages/gqty/src/Client/resolveSelections.ts	Manages fetch lifecycle by incrementing counters before fetches and decrementing in finally block
packages/gqty/src/Accessor/resolve.ts	Defines isFetching as a getter property on object and array accessors
packages/gqty/src/Accessor/meta.ts	Adds isFetching: boolean to the Meta type definition
.changeset/red-cougars-jam.md	Declares version bump for the feature (incorrect package reference)

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