Add Red Squiggly Underline Under Misspelled Words

[pavanpl]

What problem does this feature solve?

1. Detect misspelled words
2. Measure word width
3. Draw a squiggly line under the word

What does the proposed API look like?

1. Accepts a string or array of words
2. Identifies misspelled words
3. Suggests corrections
4. Can be used live inside a canvas-based editor to underline or replace misspelled words