Need a way to implement `isolated` functions

[praneesha]

Description: Need a way to implement closed records (denoted by the pipe sign) via the diagram view to implement code like below.

isolated function addEmployee(Employee emp) returns int|error {
    sql:ExecutionResult result = check dbClient->execute(`
        INSERT INTO Employees (employee_id, first_name, last_name, email, phone,
                            hire_date, manager_id, job_title)
        VALUES (${emp.employee_id}, ${emp.first_name}, ${emp.last_name},  
                ${emp.email}, ${emp.phone}, ${emp.hire_date}, ${emp.manager_id},
                ${emp.job_title})
    `);
    int|string? lastInsertId = result.lastInsertId;
    if lastInsertId is int {
        return lastInsertId;
    } else {
        return error("Unable to obtain last insert ID");
    }
}

This applies to resource functions as well when implementing a code like below.

service /employees on new http:Listener(8080) {

    isolated resource function post .(Employee emp) returns int|error? {
        return addEmployee(emp);
    }   
}

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