Make the formatValue filters configurable

I'm not sure I agree with #3 - I think if we are not stripping tags we are expecting to see the HTML as stored - and so converting HTML entities is in a way stripping the tags.

Only decoding entities if tags are stripped would also keep the behaviour consistent with csv serialization from https://git.drupalcode.org/project/csv_serialization/-/blob/4.0.1/src/En...

- Took patch from #3 and moved to MR
- Reverted change to position of Html::decodeEntities($value) for reasons outlined in #6
- Added a unit test for formatValue
- Added default value of TRUE to new property values

Looks good , thank you.

Some code style could be fixed to make it perfect.

@ericgsmith we should get this merged as soon as it's all green.

Assigned to myself to rebase and get pipeline green

All green after rebase - previous code style issues were not related to this change and fixed in 📌 Drupal 11 compatability Active