feat(package/gqty): Expose aliasGenerator option and default alias generators

[vicary]

1. Export the default alias generator and its debug counterpart.
2. Expose new aliasGenerator option
3. Deprecate aliasLength in favor of aliasGenerator

Example usage:

+ import { createDebugAliasHasher } from "gqty";

export const client = createClient<GeneratedSchema>({
+  aliasGenerator: createDebugAliasHasher(6),
  schema: generatedSchema,
  scalars: scalarsEnumsHash,
  cache,
  fetchOptions: {
    fetcher: queryFetcher,
  },
});

• Make sure it covers both variable alias and query alias
• perf: memoizing hashes for Utils/pick.ts

[github-actions]

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