Add quality/transfer rate conversions

[LimpidCrypto]

We will have different functions to convert offers quality and transfer rate.

• [ ] percent_to_transfer_rate
• [ ] decimal_to_transfer_rate
• [ ] transfer_rate_to_decimal
• [ ] decimal_to_quality
• [ ] quality_to_decimal
• [ ] percent_to_quality

Sources:

• https://github.com/XRPLF/xrpl.js/blob/main/packages/xrpl/src/utils/quality.ts

• [ ] maker_to_taker_quality
• [ ] taker_to_maker_quality