Rename RequestContext add function to set

[chamil321]

Description:

public isolated class RequestContext {
    private final map<value:Cloneable|isolated object {}> attributes = {};

    public isolated function add(string 'key, value:Cloneable|isolated object {} value) {
        if value is value:Cloneable {
            lock {
                self.attributes['key] = value.clone();
            }
        }
        else {
            lock {
                self.attributes['key] = value;
            }   
        }
    }

    public isolated function get(string 'key) returns value:Cloneable|isolated object {} {
        lock {
            return self.attributes.get('key);
        }
    }

    public isolated function remove(string 'key) {
        lock {
            value:Cloneable|isolated object {} _ = self.attributes.remove('key);
        }
    }

    public isolated function next() returns RequestInterceptor|ResponseInterceptor|HttpService|error? = external;
}

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[chamil321]

Fixed via ballerina-platform/module-ballerina-http#746