Rule to check indent level of tags

Is your feature request related to a problem? Please describe.
It would be great to have a feature that allows for checking the indent level of tags to ensure that their nesting is properly shown with the correct indentation (i.e. number of spaces or tabs), configurable to a certain number of spaces or a tab as the indent.

Describe the solution you'd like
For example, incorrect code with this rule may look like:

<ul>
<li> <!-- Not indented from parent -->
    <p>Hello world</p>
</li> <!-- Not indented from parent -->
</ul>

or, in the case of a set number of spaces (e.g. 4):

<ul>
    <li>
         <p>Hello world</p> <!-- Error: 9 spaces, expected 8 -->
   </li> <!-- Error: 3 spaces, expected 4 -->
</ul>

Describe alternatives you've considered
Issues #73 and #153 were closed due to inactivity, but this feature is still relevant and would be incredibly useful to ensure that proper tag nesting is reflected through consistent indentation.

Additional context
N/A

Start by reviewing HTMLHint's existing rule implementations and their tests to understand how configurable checks are structured. Define the expected indentation behavior for nested tags, spaces, and tabs using the examples in this issue, then add coverage showing that incorrect indentation is reported and valid indentation is accepted.