kad: Add support for content providers

Add support for [content providers](https://github.com/libp2p/specs/blob/master/kad-dht/README.md#content-provider-advertisement-and-discovery) to litep2p Kademlia implementation.

This is needed to implement [`RFC-0008: Store parachain bootnodes in relay chain DHT`](https://github.com/polkadot-fellows/RFCs/blob/main/text/0008-parachain-bootnodes-dht.md) and [`RFC-0059: Add a discovery mechanism for nodes based on their capabilities`](https://github.com/polkadot-fellows/RFCs/blob/main/text/0059-nodes-capabilities-discovery.md) with litep2p network backend.

- [x] https://github.com/paritytech/litep2p/issues/195
- [x] https://github.com/paritytech/litep2p/issues/201
- [x] https://github.com/paritytech/litep2p/issues/202

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kad: Add support for content providers #196

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kad: Add support for content providers #196

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