Draft: Implement barcode payment, remove complexity and unnecessary code

[darkdks]

Status: In progress, help wanted to complete this tecnical debit.

• Resolved merge conflits from main and the old branch.
• Implementation of boleto payment.
• Simplified typing for status responses
• More tests are needed
• Simplified status representation from class to string literals:

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[darkdks]

@MarcosGrandesso @walison17 if you guys have some free time to write or rewrite a few tests, that would be greatly appreciated. ✅

Doing this, kill our last boss. deprecated boleto payment with private code.