bkpr: exclude non-wallet events in the balance snapshot

Anchor outputs are ignored by the clightning wallet, but we keep track
of them in the bookkeeper. This causes problems when we do the balance
checks on restart w/ the balance_snapshot -- it results in us printing
out a journal_entry to 'get rid of' the anchors that the clightning node
doesnt know about.

Instead, we mark some outputs as 'ignored' and exclude these from our
account balance sums when we're comparing to the clightning snapshot.

common/coin_mvt.c

@@ -288,6 +288,19 @@ struct chain_coin_mvt *new_coin_wallet_deposit(const tal_t *ctx,
 				      amount, true);
 }
 
+struct chain_coin_mvt *new_coin_wallet_deposit_tagged(const tal_t *ctx,
+						      const struct bitcoin_outpoint *outpoint,
+						      u32 blockheight,
+						      struct amount_sat amount,
+						      enum mvt_tag *tags TAKES)
+{
+	return new_chain_coin_mvt_sat(ctx, WALLET, NULL,
+				      outpoint, NULL,
+				      blockheight,
+				      take(tags),
+				      amount, true);
+}
+
 struct chain_coin_mvt *new_coin_wallet_withdraw(const tal_t *ctx,
 						const struct bitcoin_txid *spend_txid,
 						const struct bitcoin_outpoint *outpoint,