feat(icons): add 20x20 and 24x24 assets for arrow--right.svg (carbon-…

…design-system#452)

* Added `inner-path` adornments to misuse.svg, checkmark--filled.svg

Added `inner-path` adornments to misuse.svg, checkmark--filled.svg; created all 4 sizes. adronment opacity and fill can now be styled by targeting the `inner-path`.

* Add error--filled.svg, normalize other notifications icons

Added 20, 24 sizes of error--filled with stylable `inner-path`. Adjusted others to normalize size, layer order, inner-path

New:
20/error--filled.svg
24/error--filled.svg

Changed:
16/error--filled.svg
16/warning--filled.svg

20/warning--filled.svg

24/checkmark--filled.svg
24/misuse.svg
24/warning--filled.svg

32/checkmark--filled.svg
32/error--filled.svg
32/warning--filled.svg

* update 16/warning--filled.svg

fix off center inner elements

* update 16/warning--filled.svg

* Update 20/warning--filled.svg

* creat 20, 24 arrow--right.svg

Since it's in the site banner, created 20 and 24 versions of arrow--right.svg