annotated: quotes are not preserved

Discovered in bblfsh/javascript-driver#81 (comment) and as noted at bblfsh/javascript-driver#81 (comment) - this driver does not handle string literals in annotated mode the same way as other drivers do: it does not preserve the " and ' as part of the literal value in annotated mode.

On

bc = "b\nc"
bcq = 'b\ncq'

//*[@role='String' and @role='Literal'] XPath query results in

"@token":"b\nc","@type":"Str"
"@token":"b\ncq","@type":"Str"

For annotated mode, @token values should be:

'b\\ncq'
\"b\\ncq\"

Other test cases to consider while we're looking at this code: ''' and """ and their variants (e.g., r''', u""", etc.)

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