feat: parse fees included in SEPATransaction

[barredterra]

Adds support for storing included fees from SEPA CAMT transaction details during EBICS import.

• Uses Chrgs/TtlChrgsAndTaxAmt to populate included_fee on created Bank Transactions.
• Adds robust amount parsing (handles comma decimals, empty values, and malformed inputs safely).
• Skips included fee assignment when charge currency and transaction currency do not match.

Test Plan

• Import a CAMT file where TtlChrgsAndTaxAmt/@Ccy matches transaction currency, then verify included_fee is populated.
• Import a CAMT file with invalid/empty TtlChrgsAndTaxAmt and verify included_fee falls back to 0.0.
• Import a CAMT file with mismatching currencies and verify included_fee is 0.0.

[barredterra]

🎉 This PR is included in version 15.32.0 🎉

The release is available on GitHub release

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