checkers/internal/astwalk: adapted from a lintpack #934
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Since we might want to reduce dependencies from
a lintpack project that is going to be replaced
with go/analysis, it's beneficial to move useful
things we want to keep inside go-critic repository.
astwalk only depends on the lintpack.FileWalker
interface that can be easily moved or replaced later.
Refs #854
Signed-off-by: Iskander Sharipov quasilyte@gmail.com