feature: Advanced distant relationships for the table builder

[danharrin]

Replaces #5075.

[what-the-diff]

• Added a new column type: ListColumn
• Updated the documentation for all columns to reflect this change
• Renamed some of the existing docs files so that they are in order by name (this is purely cosmetic)
• Added support for grouped summaries.
• Fixed a bug where the state of columns with relationships was not being updated correctly when updating multiple records at once (e.g., using bulk actions).
• Changed getFormattedState() to formatState(mixed $state). This is because it's more descriptive and also allows us to pass in additional parameters, such as the record itself or other states from related models that may be needed by some formatters/summarizers (such as those used on pivot tables).
• Added a new column type called ListColumn.
• Changed the Average summarizer to use an alias for its select statement, so that it can be used in conjunction with other summarizers on the same table column without causing conflicts (e.g., when using both average and sum).
• Moved formatState() from Concerns/CanFormatState into Summarizer class itself, since all of our current summarizers are formatting their state anyway; this also allows us to remove some unnecessary code duplication between CanFormatState and InteractsWithTableQuery traits where we were evaluating $this->formatUsing(). This change is backwards compatible because any custom classes extending Summarizer will still have access to formatState(), but they'll need to call parent::format($state) if they want formatted output instead of raw data returned by getSelectedValue().
• Added getSelectStatements method to summarizers.
• Added selectedState method to summarizers, which allows you to set the selected state of a filter/summarizer manually (for example when using server-side pagination).
• Changed how relationships are joined in filters and summaries so that they can be nested more than one level deep now (e.g.: user->posts->comments)
• Added a new method to the Group class called groupQueryUsing.
• Changed getTitleFromRecordUsing from protected to public in the Column class and added an example of how it can be used in documentation for that same method.
• Fixed bug where formatted state was not being set correctly on table columns when using formatState(). This is because we were comparing against $column->getFormattedState() instead of $column->formatState($column->getState()) which would always return null since there's no way for us to know what record should be passed into formatColumnValue(). We now pass an empty array as this argument so that if you're using something like Carbon, then calling ->diffForHumans() will work properly without having any errors thrown about missing arguments or anything else weird happening with your formatting logic (which could happen depending on how you have things setup).
• Updated tests accordingly by adding assertions around these changes and fixing some other minor issues I found while working through all of this stuff related to summaries/groups/etc...