Bump h3lib to v4.4.1 and add new functions/errors

[ajfriend]

• Update h3lib to v4.4.1. (Bump h3lib to v4.4.1 and add new functions/errors #470)
  • Add new error codes:
    • H3IndexInvalidError
    • H3BaseCellDomainError
    • H3DigitDomainError
    • H3DeletedDigitError
  • Add new functions:
    • is_valid_index
    • get_index_digit
    • construct_cell
    • deconstruct_cell (note that this function doesn't currently exist in C library)

[dmitryzv]

Why add deconstruct_cell in this change. I think it introduces some confusion.

[ajfriend]

Why add deconstruct_cell in this change. I think it introduces some confusion.

It is a useful function that I often end up having to code by hand, so I think it's helpful to add. See, for example, how it's used in the tests.

Would you prefer it to be added in a separate PR? I can do that, but I'll have to rework the tests and I think they'll become less clear.