The ChannelMonitor::get_claimable_balances method provides a more
straightforward approach to the balance of a channel, which satisfies
most use cases. The computation of AvailableBalances::balance_msat is
complex and originally had a different purpose that is not applicable
anymore. We deprecate AvailableBalances::balance_msat now and will remove
it in a following release.
Co-authored-by: Willem Van Lint <noreply@wvanlint.dev>