feat(ui): add new datepicker component

[sschimper-splunk]

Issue number: 1758

PR Type

What kind of change does this PR introduce?

• Feature
• Bug Fix
• Refactoring (no functional or API changes)
• Documentation Update
• Maintenance (dependency updates, CI, etc.)

Summary

Added datepicker component to UI (using '@splunk/react-ui/Date') for modular inputs to facilitate the specification of date information.

Changes

• added datepicker component to UI (using '@splunk/react-ui/Date')
• added unit tests and storyboard file for this component
• added section about this component to documentation

User experience

You can add the following to your globalConfig.json:

{
    "type": "date",
    "field": "example_date",
    "label": "Example Date",
    "help": "This is an example date field for the input one entity",
    "required": true
},

This generates a Datepicker component as shown below:

Checklist

If an item doesn't apply to your changes, leave it unchecked.

Review

• self-review - I have performed a self-review of this change according to the development guidelines
• Changes are documented. The documentation is understandable, examples work (more info)
• PR title and description follows the contributing principles
• meeting - I have scheduled a meeting or recorded a demo to explain these changes (if there is a video, put a link below and in the ticket)

Tests

See the testing doc.

• Unit - tests have been added/modified to cover the changes
• Smoke - tests have been added/modified to cover the changes
• UI - tests have been added/modified to cover the changes
• coverage - I have checked the code coverage of my changes (see more)

Caution

At the moment tests/smoke/test_ucc_build.py::test_ucc_generate_with_everything is failing after I introduced my changes.

Demo/meeting:
I can make myself available for a time that suits you.

Reviewers are encouraged to request meetings or demos if any part of the change is unclear

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