Support for animation-composition in FF104 (#17518)
Support for animation-composition in FF104 (#17518)

* Adds a json file copy for animation-composition

* Updates support for animation-composiiton in FF

* Updates standard track value
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data