support `graphql-config` config manage graphql configs

[oooplz]

graphql-config is awesome plugin for graphql.graphql-config

i want not need manager multiple graphql url in project.
Ex:
1.in nuxt.config.ts file
apollo: { defaultOptions: { $query: { loadingKey: 'loading', fetchPolicy: 'cache-and-network' } }, clientConfigs: { default: { httpEndpoint: 'https://my-url' } } }

2. in .graphqlconfig config file
   { "name": "xxx", "schemaPath": "./schema.graphql", "extensions": { "endpoints": { "Default GraphQL Endpoint": { "url": "https://my-url" } } } }

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