enhancement(Timepicker) implementation with confirmation buttons util

[gselderslaghs]

Proposed changes

This pull request is a follow up of #572 and #574 and handles the implementation of the Utils.createButton with callback method and the Utils.createConfirmContainer with callback methods

With the callback function, we can open and close modal (or custom) implementation in combination with timepicker with the onDone and onCancel callbacks

Example:

html

<div class="row">
    <div class="input-field datepicker-field s12">
        <input id="timepicker" type="text" class="timepicker">
        <label for="timepicker">Time</label>
    </div>
</div>

<dialog class="modal" style="width: 620px"></dialog>

script

M.Timepicker.init(document.querySelectorAll('.timepicker'), {
    autoSubmit: false,
    container: '.modal',
    onInputInteraction: () => {
        toggleModal();
    },
    onDone: () => {
        toggleModal();
    },
    onCancel: () => {
        toggleModal();
    }
});

const modal = document.querySelector('.modal');
const toggleModal = () => {
    if (!modal.hasAttribute('open')) {
        modal.setAttribute('open', 'true');
    } else {
        modal.removeAttribute('open');
    }
}

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to change).

Checklist:

• I have read the CONTRIBUTING document.
• My commit messages follows the conventional commit format
• My change requires a change to the documentation, and updated it accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[gselderslaghs]

Implemented additional check to render confirmation container only if auto submit is false (as in #572)
Fixed incorrect callback function check

This is ready for review

[wuda-io]

Thanks for the awesome work! I will take a look next year and review it.

Best wishes to all contributors and take care going into the new year. See you all soon ❤️

[wuda-io]

Really like the approach with creating the button elements dynamically.
We should consider a create function for other elements as well.

The merge-base changed after approval.