Expose way to select only (n-)confirmed UTXOs for TX creation

[tnull]

Describe the enhancement
Add a way to create transactions with bdk::Wallet that only spend confirmed UTXOs.
This could easily be done by adding a corresponding must_only_use_confirmed_tx field to TxParams and ORing it into

bdk/crates/bdk/src/wallet/mod.rs

Line 1473 in 81c7613

if must_only_use_confirmed_tx && !confirmation_time.is_confirmed() {

However, TxParams is currently pending exposure:

bdk/crates/bdk/src/wallet/tx_builder.rs

Line 129 in 81c7613

//TODO: TxParams should eventually be exposed publicly.

Use case
This is needed to use BDK's coin selection for bumping transactions generated by LDK, in particular for https://docs.rs/lightning/0.0.116-alpha1/lightning/events/bump_transaction/trait.CoinSelectionSource.html#tymethod.select_confirmed_utxos

[danielabrozzoni]

Concept ACK, I've added this one to #988 so that I don't forget about it.

You probably already know this, but as a workaround you could add all the unconfirmed utxos to the unspendable list :/

[tnull]

Concept ACK, I've added this one to #988 so that I don't forget about it.

Ah, thank you!

You probably already know this, but as a workaround you could add all the unconfirmed utxos to the unspendable list :/

Ah, yeah, it's a bit clunky but makes sense I guess.