Add client_id to getClusterNodes RPC response

[DmitriDmitriDmitri]

The getClusterNodes RPC method currently returns node information including version and feature set, but doesn't expose which client is running

Added client_id field to RpcContactInfo struct in rpc-client-types/src/response.rs
Updated getClusterNodes RPC handler in rpc/src/rpc.rs to populate client_id from the node's version info

[mergify]

If this PR represents a change to the public RPC API:

1. Make sure it includes a complementary update to rpc-client/ (example)
2. Open a follow-up PR to update the JavaScript client @solana/kit (example)

Thank you for keeping the RPC clients in sync with the server API @DmitriDmitriDmitri.

[steviez]

There was a previous attempt at this in #7817 that has yet to be reviewed (CC @alannza)

[joncinque]

Closing this in favor of #7817, which also handles CLI changes