Specification for Slinky integration

[uditvira]

Slinky will be available on Neutron in the coming release. To improve price accuracy, we should migrate to using Slinky instead of our internal TWAP.

Note that not all denoms will be supported by Slinky out of the box. We should transition in a gradual manner

[Art3miX]

https://docs.skip.build/connect/using-connect/neutron-sdk#getting-all-supported-markets-on-connect-and-checking-to-see-if-an-individual-market-is-included