protocols/kad: Support multiple protocol names

[dmitry-markin]

Description

Add support for multiple Kademlia protocol names to allow protocol name upgrades.

Links to any relevant issues

Resolves #2837.

Change checklist

• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• A changelog entry has been made in the appropriate crates

[mxinden]

Thanks @dmitry-markin for the patch!

[mxinden]

This looks good to me. Thanks @dmitry-markin for the follow-ups.

Would you do me a favor and prepare a pull request that removes the deprecated methods. This pull request we can merge once libp2p-kad v0.40.0 was released, thus removing the deprecated methods with libp2p-kad v0.41.0.

[dmitry-markin]

Would you do me a favor and prepare a pull request that removes the deprecated methods. This pull request we can merge once libp2p-kad v0.40.0 was released, thus removing the deprecated methods with libp2p-kad v0.41.0.

Sure, can do this. @mxinden, meanwhile, could you merge this PR — GitHub says "Only those with write access to this repository can merge pull requests."

[mxinden]

@dmitry-markin do you need a new release soonish, or is depending on master unblocking you for now?

[dmitry-markin]

@mxinden substrate consumes libp2p from crates.io, so having the changes released would be great. Nevertheless, it's not something super urgent.

[dmitry-markin]

Would you do me a favor and prepare a pull request that removes the deprecated methods. This pull request we can merge once libp2p-kad v0.40.0 was released, thus removing the deprecated methods with libp2p-kad v0.41.0.

A follow-up PR that removes the deprecated methods: #2866.