Create Vishraam functions

### Summary

replace(str, optionalMappings)
which should remove vishraams by default, but can also replace them if need be

and 
tree(str)
which should turn 

# hrf. dad; dasd asdas dasd || adsad. asdadadada
# <><heavy>dad <medium>dad</medium></heavy> dasd asdas dasd</>
into a balanced tree representing the XML here 

### Approach

_No response_