Support .sindriignore in create_circuit method

[KPreisner]

Support .sindriignore in create_circuit method

When a user supplies a directory as their upload path for the create_circuit method, the method automatically tars up the directory before sending it. The tarring should read the contents of a .sindriignore file (if it exists) and exclude those files/paths from the tar.

[KPreisner]

This is how we do it in the JS SDK: https://github.com/Sindri-Labs/sindri-js/blob/main/src/lib/client.ts#L435-L451

[KPreisner]

Here is a Python gitignore parser that we can use: https://github.com/mherrmann/gitignore_parser