Feature execute method

[mrosenlund]

Description

This pull request adds support for executing methods directly in cron jobs configured with the hapi-cron plugin.

Changes

• Added an execute option to the job configuration, allowing users to specify a function to be executed at the scheduled time.
• Modified internals.trigger to handle the execute option in addition to the existing request option.
• Updated validation to ensure either job.request or job.execute is provided.

Example Usage

const server = Hapi.server({ port: 3000, host: 'localhost' });

const myFunction = async () => {
    console.log('myFunction was called!');
    return 'Function execution result';
};

await server.register({
    plugin: HapiCron,
    options: {
        jobs: [
            {
                name: 'myFunctionCron',
                time: '*/10 * * * * *', // every 10 seconds
                timezone: 'America/Vancouver',
                execute: myFunction,
                onComplete: (result) => {
                    console.log('Job completed with result:', result);
                }
            }
        ]
    }
});