Automatic generation of queries and mutations

Since s2dm modeling approach aims to empower domain experts (usually non-modelers), the idea is that they model actively in the GraphQL SDL type system. To keep it simple, the capabilities on the data described in the SDL can be automatically created in the form of `Query` and `Mutation`. For example:

The data structure is maintained by domain expert: What a seat is and what fields does it have?
```graphql
type Seat {
...
}
```

whereas the capabilities are produced automatically by the tools: What a seat can do (or what one can do on a seat)?

```graphql
type Query {
...
}

type Mutation {
...
}
```

What is the best generic pattern that makes sense to use for those API operation templates?

The issue names no implementation files, tests, or entry points. Start from the GraphQL SDL examples and establish the intended generic Query and Mutation templates; done means the pattern and scope are agreed clearly enough to implement.

Written by the indexing model from the issue text.