fix: support pug extends #599
                
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*Machine translation from Japanese to English at DeepL.
#459
#572
I came up with a solution to the above Issue and PR.
Use
pug-lexerto extract the line with the extends syntax and move it to the top line.This will work even with comments and
prependData.I think it needs to be tested, but I have not written it because I do not know how to write it correctly.
I would appreciate it if you could add it to this PR or create it separately.
Tests
npm testorpnpm test