[Chronik] Bridge calc_fee and default_max_raw_tx_fee_rate_per_kb to Rust

Summary: sendrawtransaction uses these to calculate the maximum fee. By bridging them we can use the same calculation in QueryBroadcast::broadcast_txs, see D15370.

Test Plan: ninja test_bitcoin && ./src/test/test_bitcoin -t chronikbridge_tests

Reviewers: PiRK, #bitcoin_abc

Reviewed By: PiRK, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D15409