fix(awk): support backslash-newline line continuation#841
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Backslash immediately before a newline is now treated as line continuation in awk programs — the two characters are removed and the physical lines are joined. This is standard POSIX awk behavior. Closes #836
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Summary
Test plan
awk_backslash_newline_continuation— basic line continuation in expressionawk_backslash_newline_condition— line continuation in conditioncargo fmt --checkandcargo clippycleanCloses #836