Resolve Credit to Account impls of `OnUnbalanced` trait (#1876)

Implements the `OnUnbalanced` trait to resolve received credits to the
specified account. Credits that fail to resolve are dropped.

### Motivation 
Throughout the codebase, several types implement the trait with the same
behavior. While some currently utilize older currency trait, a migration
to the new fungible/s is anticipated for all. Examples:
[1](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/cumulus/parachains/common/src/impls.rs#L37),
[2](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/polkadot/runtime/common/src/impls.rs#L36),
[3](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/substrate/bin/node/runtime/src/impls.rs#L40),
[4](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/substrate/bin/node/runtime/src/lib.rs#L1969),
[5](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/substrate/frame/broker/src/mock.rs#L198),
[6](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/substrate/frame/society/src/lib.rs#L2031),
[7](https://github.com/paritytech/polkadot-sdk/blob/1b34571c/substrate/frame/treasury/src/lib.rs#L1118)