[New Feature]: Introduce an API to obtain initializer method type from ObjectType

[MohamedSabthar]

Description

At present, invoking getMethods() function on the ObjectType produces an array of methods that does not comprise the init method. However, there is a need to obtain access to the init method type of the ObjectType for constructing the service object.

Consider the following class

readonly service class Sort {
    *graphql:Directive;
    Direction direction;

    function init(Direction direction, int data) {
        // ...
    }

    isolated remote function applyOnField(graphql:Context ctx, graphql:Field 'field) 
    returns anydata|error {
       // ...
    }
}

Calling getMethods() on the above class returns an array containing applyOnField method but not the init method.

Describe your problem(s)

We have a requirement in GraphQL module to construct service objects from a given object typedesc. To do that the knowledge of the init method parameter types is necessary to create the relevant object by constructing those values in the native side. Unfortunately, currently there isn't a straightforward approach to create an object from a typedesc.

Describe your solution(s)

I can think of two ways:

1. Modify the getMethods() function to include the type of the init method in the returned array.
2. Introduce a new function called getInitializer() that solely returns the methodType of the init method.

Related area

-> Compilation

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[ThisaruGuruge]

@warunalakshitha @HindujaB Can we prioritize this for the next sprint? A GraphQL feature is waiting on this.