Fixes #85

Implement tracking for DateTime and Referrer Data for `LinkBundle` and Clicks and DateTime for `Link`.

* **Shared/LinkBundle.cs**
  - Add `CreatedDate` property to track the creation date of the `LinkBundle`.
  - Add `ReferrerData` property to track the referrer data of the `LinkBundle`.

* **Shared/Link.cs**
  - Add `Clicks` property to track the number of clicks for the `Link`.
  - Add `CreatedDate` property to track the creation date of the `Link`.

* **Api/Functions/CreateLinkBundle.cs**
  - Set the `CreatedDate` property of the `LinkBundle` to the current date and time when creating a new `LinkBundle`.
  - Set the `ReferrerData` property of the `LinkBundle` to the referrer data from the request headers.

* **Api/Functions/GetLinkBundle.cs**
  - Increment the `Clicks` property of each `Link` when a `LinkBundle` is retrieved.
  - Update the `CreatedDate` property of each `Link` to the current date and time when a `LinkBundle` is retrieved.

* **Client/Shared/LinkBundleDetails.razor**
  - Display the `CreatedDate` property of the `LinkBundle`.
  - Display the `ReferrerData` property of the `LinkBundle`.

* **Client/Shared/LinkBundleItem.razor**
  - Display the `Clicks` property of the `Link`.
  - Display the `CreatedDate` property of the `Link`.

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