vektah / gqlparser / 753

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Fix quote handling at end of block string descriptions (#355)

* test: add test demonstrating quotes at end of description bug

When a block string description ends with quotes immediately followed by
triple quotes, the parser fails with an "Unexpected <Invalid>" error.
This test demonstrates the issue by comparing a working case (with space
between the quote and closing triple quotes) and the failing case.

* fix: properly handle quote characters at end of block string descriptions

The lexer was incorrectly handling the case where a quote character (")
appeared immediately before the closing triple quotes (""").

The fix changes how the lexer identifies closing triple quotes:
- When a quote character is encountered, we now count consecutive quotes
- If there are 3 or more quotes in a row, we treat the last 3 as the closing triple quote
- Any extra quotes (beyond the closing 3) are added to the string content

This handles cases like:
- """This is a "test"""" (quote followed by closing triple quotes)
- """This is a ""test""""" (multiple quotes followed by closing triple quotes)

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