Added spinnerPosition prop to allow modifying the position of the spinner.

[shashwtd]

Allowing control over spinner position.

This pull request introduces a new prop, spinnerPosition, to the NextJS TopLoader component. The spinnerPosition prop allows developers to control the position of the spinner on the screen. The supported values for this prop are:

• top-left
• top-right
• bottom-left
• bottom-right

By default, the spinner is positioned at the top-right corner ("top-right"), ensuring that existing implementations continue to work as expected unless the prop is specifically set.

Changes:

• Added spinnerPosition prop to the TopLoader component.
• Updated the default configuration and documentation to reflect the new prop.

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Reason for Change:

In one of my projects, I wanted to place the loader bar at the top and the spinner in the bottom-right corner. However, this wasn’t easily possible with the current setup without using a custom template. To solve this, I decided to add the spinnerPosition feature to make it easier for others who might need the same flexibility.

[shashwtd]

@gwendall