Closes: #19338 - GraphQL: Adds in_list lookups for id and enum fields

[bctiemann]

Closes: #19338

Breaking change. Adds exact: and in_list: and is_null: semantics to GraphQL queries for id fields and enum field types, which also means that bare values are no longer supported.

This means the following queries are valid:

{
    location_list( filters: {
        status: {exact: STATUS_PLANNED},
        OR: {status: {exact: STATUS_STAGING}}
    }) {
        id site {id}
    }
}

{
    location_list( filters: {
        status: {in_list: [STATUS_PLANNED, STATUS_STAGING]}
    }) {
        id site {id}
    }
}

However the following (which worked previously) is not:

{
    location_list( filters: {
        status: STATUS_PLANNED,
        OR: {status: STATUS_STAGING}
    }) {
        id site {id}
    }
}