Add string conversions

[LimpidCrypto]

Structure

• Topic

  • function, structure, addition, removal, ...

    1. Short explanation of the change.

    2. Short explanation how the change works.

    3. Some particularities.

    fields	type	explanation

    Sources:

    • ...

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• str_to_hex -> &str

  1. A function to convert a UTF-8-encoded string into hexadecimal encoding.

  fields	type	explanation
  string	&str	A UTF-8-encoded string.

  Sources:

  • https://github.com/XRPLF/xrpl-py/blob/master/xrpl/utils/str_conversions.py#L4

• hex_to_str -> &str

  1. A function to convert a hex string into a human-readable string.

  fields	type	explanation
  hex_string	&str	A hex string.

  Sources:

  • https://github.com/XRPLF/xrpl-py/blob/master/xrpl/utils/str_conversions.py#L19