gookit / goutil / 40504890076

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feat(maputil): support the bracket index path in the get helpers

GetByPath, GetByPathKeys and GetFromAny only accepted the dot-index form
("top.arr.1"), so a path like "top.arr[1]" - which SetByPath already writes -
returned nothing.

- expand the trailing "[N]" indexes of a key segment before the walk, so
  "top.arr[1]", "top.matrix[0][1]" and "top.items[1].name" resolve. The
  top-level key is indexable too ("tags[0]"), as it already is on the set side.
- the literal key is matched first, so a key that really contains brackets
  (eg. "child[x]", "a[0]") keeps working as before. A negative index, an empty
  index and a bare "[0]" segment are kept as literal keys as well.
- the dot-index style ("top.arr.1") is unchanged.

Tests: top-level, nested and multi-index paths, out of range, negative and
empty indexes, the literal bracket keys, and the GetByPathKeys/GetFromAny
entries.

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