feat(faustwp-core): add typed GraphQL client (fetchGraphQL<T>) and FaustClient

[ArjunSaluja]

Adds a typed GraphQL client and helper to packages/faustwp-core.
.fetchGraphQL — a generic typed fetch wrapper for GraphQL. .FaustClient — lightweight client for queries and mutations. . Shared GraphQL response types (types.ts`).
. Includes a small Jest test for typed usage.

.Improves developer experience and ensures GraphQL responses are strongly typed.

Example

type Result = { post: { id: string; title: string } };
const client = new FaustClient(process.env.FAUST_GRAPHQL_URL!);
const { post } = await client.query<Result>(`query { post(id: "1") { id title } }`);

[headless-platform-by-wp-engine]

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Latest commit: b4955a8

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