Provide an normalization routine for normalizing Path

[adithyaov]

We often compare paths by comparing the underlying arrays.
If one path is a/b and the other is a//b the equality check will fail.
Instead, we should ensure normalized paths or document that Path is not guaranteed to be normalized.

[harendra-kumar]

It is not a good idea to normalize when creating. It will be expensive to normalize when constructing e.g. we will have to normalize all paths when reading a directory. It may be better to provide a normalized comparison rather. Or an explicit normalization routine.

[adithyaov]

We should provide an explicit normalization routine.