Convert GraphQLRequest and ArgumentValue to record types

[jonasessen]

Problem

GraphQLRequest and ArgumentValue are plain data-transfer objects — they exist solely to hold values with no behaviour. They are currently defined as class types, which:

• Allows accidental mutation after construction
• Uses reference equality (two instances with identical data are not equal)
• Requires more boilerplate than necessary

Solution

Convert both to C# record types, which are designed exactly for this purpose.

GraphQLRequest — fully immutable. Both properties become init-only since the object is constructed once and never mutated:

// Before
public class GraphQLRequest
{
    public string Query { get; set; }
    public Dictionary<string, object> Variables { get; set; }
}

// After
public record GraphQLRequest
{
    public string Query { get; init; }
    public Dictionary<string, object> Variables { get; init; }
}

ArgumentValue — mostly immutable. GraphName, GraphType, and Value are set at construction and never changed (init). VariableName remains set because the query builder appends a uniqueness suffix to it during query construction — this is noted with a comment.

Benefits

• Immutability — init-only properties prevent accidental mutation after construction
• Value equality — two instances with identical data compare as equal, which is the natural expectation for DTOs
• with expressions — callers can cleanly create modified copies: request with { Query = newQuery }
• Better ToString() — records produce a readable representation automatically, useful for debugging

Compatibility

Both changes are fully backward-compatible. Object initializer syntax (new GraphQLRequest { Query = ..., Variables = ... }) works identically with init properties.

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