[FAB-14821] More rigorous validation against Raft config metadata - Hyperledger JIRA

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Channel creation tx should be validated *before* being proposed to avoid crashing orderer due to malformed config tx.

this should also be done with config tx targeting current channel (instead of creation)

relates to

FAB-6135 Raft Consensus (etcd/raft)

1.	Change nwo `CreateChannelFail` to match the signature of `CreateChannel`	Closed	Jay Guo
2.	validate Raft config metadata at channel creation	Closed	Jay Guo
3.	add an integration test to assert malformed Raft config doesn't crash orderer	Closed	Jay Guo
4.	Apply config metadata validation to non-channel-creation configs	Closed	Jay Guo
5.	Ensure PEM contains a certificate	Closed	Yacov Manevich