Added text and link properties to menu-item.model.ts

[otuoma]

References

• Fixes MenuItemModel lacks text and link properties #3748
• Related to PR Add link and text properties to MenuItemModel #3749 which was closed because it contained unrelated commits.

Description

In strongly typed typescript setups, using the properties 'link' and 'text' on instances of MenuItemModel fails with the following error

Object literal may only specify known properties, and 'text' does not exist in type 'MenuItemModel'.

List of changes in this PR:

• Added link and text properties to MenuItemModel only. From other usage examples, an optional 'icon' property may also be required.

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