Add support for applying delta/factor transformations for TextTheme height, letter and word spacing #158102
Description
Use case
When switching from the the default material font, many times the height, letter spacing and word spacing need to all be adjusted slightly. doing this for all each text style is annoying.
Proposal
The text theme has the apply method which does bulk operations and even includes support for delta/factor ajustements for font size. This should also have height, letter and word spacing,