Support Starknet cointype

[makoto]

Here is the encoding/validation logic: https://github.com/0xs34n/starknet.js/blob/develop/src/utils/address.ts

Example: https://github.com/ensdomains/address-encoder/pull/47/files

Please provide a reference link so we can check you did the encoding correctly.

We'd like to keep the encoding library as small as possible, so please be efficient in your use of space. If your PR expands the file size of the library too much, we won't accept it.

Checklist:

Please follow the list below before submitting your PR

• My code follows the code style of this project.
• My code implements all the required features.
• I have specified correct coinTypes specified at Slip 44
• I have provided the reference link to the specification I implemented.
• I have provided enough explanation about how I provided the test address