Enatega Admin Dashboard: Allow users to Add new Options from dropdown in Addons.

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**Describe the bug**
Currently, users can only select from predefined options in the Addons dropdown. This enhancement will allow users to add new options directly from the dropdown while adding a products addons.
**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Enatega Admin Dashboard'
2. Go to Store profile.
3. Add a new Product , while adding variations now click on Add-ons. Add option screen will show up now see at bottom an input field with name options.
4. Create there an option , to add some new options which will show up in the dropdown.

**Expected behavior**

1. A new "Add New Option" button or input field should be available within the dropdown.
2. When a user enters a new option, it should be saved and immediately appear in the dropdown.
3. The new option should be persisted in the database so it is available for future selections.

**Screenshots**

**Desktop (please complete the following information):**
- OS: [e.g. Windows]
- Browser [e.g. Chrome]
- Version [e.g. Latest]

Start in the Enatega Admin Dashboard by reproducing the Store profile path through product variations and the Add-ons option screen. Inspect the dropdown and the option-saving flow; done means users can create a new option, see it immediately in the dropdown, and find it available for future selections.

Written by the indexing model from the issue text.