[IC-Date-Input] - move component into core package

## Summary
The ic-date-input component should be moved from canary into the core package

## 💬 Description
Work to be done:
- Move component code into the core package (removing from canary)
- Ensure sufficient unit test coverage
- Ensure sufficient cypress testing
- Storybook code\docs may need restructuring to match format in core package

## Guidance
The guidance site will need work doing to remove canary status

Start by locating the ic-date-input component in the canary package and reviewing the core package structure. Then inspect the existing unit tests, Cypress tests, Storybook code, and guidance site references mentioned in the issue. Done means the component is in core, removed from canary, adequately tested, and no longer marked as canary in the guidance documentation.

Written by the indexing model from the issue text.