Implement "Clean" rule type

[naglepuff]

This type of redaction action is mentioned here: https://dicom.nema.org/dicom/2013/output/chtml/part15/chapter_E.html#table_E.1-1

It could be useful to allow for different redaction levels. Having a redaction method that scrubs identifying information but replaces data with a similar value would help to enable that.

[naglepuff]

This type of redaction was introduced specifically for date values in #235.

In order to expand on this type of functionality, we could leverage the system of redaction profiles and rule types.

For dates, a new rule type was introduced:

class ModifyDateRule(_Rule):
    action: Literal["modify_date"]

as well as code that handles actually replacing the old data (precise date) with new data (a fuzzy date):

def _get_modified_date(self, element: DataElement) -> str | None:
	...

This could be generalized to apply to different value representations present in the DICOM standard, or analogs could be implemented for other use cases. The MetadataReplaceRule also exists as a tool that can serve implementing additional "clean" redaction profiles.

One approach to implementing the "Clean Desc. Option" from this table would be to create a rule set called e.g. clean_description_rules.yaml which uses either a new rule type or an existing rule type to replace the values as described in the linked document.

This ruleset should contain a rule for each attribute with a "C" in the cell in the "Clean Desc. Option" column. It can be used as a new profile, and also as a reference for end users who need more fine tuning for this type of redaction.