feat(cli-utils): Implement multi-schema support for CLI commands

[kitten]

Resolves #248
Related to #257

This implements multi-schema support, as per the RFC, in the CLI. This, together with 0no-co/GraphQLSP#303 fully resolves the RFC and implements true multi-schema support.

A given tsconfig.json with the plugin configuration can now set up multiple schemas:

{
  "compilerOptions": {
    "plugins": [
      {
        "name": "@0no-co/graphqlsp",
        "schemas": [
          {
            "name": "pokemon",
            "schema": "./schema.graphql",
            "tadaOutputLocation": "./src/graphql-env.d.ts",
            "tadaTurboLocation": "./src/graphql-cache.d.ts",
            "tadaPersistedLocation": "./src/persisted.json"
          },
          // ...
        ]
      }
    ]
  }
}

These can be used by instantiating them with initGraphQLTada via the output file (as specified by tadaOutputLocation).
The new configuration is fully validated (as can be seen when running gql.tada doctor.

Warning

Whenever a command accepts an --output argument, this is now unsupported by the CLI command in favour of clear configuration options (i.e. tadaOutputLocation, tadaTurboLocation, and tadaPersistedLocation)
This is except for the generate schema command, with which multiple schema requires the --output option now.

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