* rename provedID
rename provedID to counterpartyChosenID for connection and channel. Update if statement in handshake and tests. Ref: https://github.com/cosmos/cosmos-sdk/pull/7439#discussion_r498858944
* update docs
Co-authored-by: Christopher Goes <cwgoes@pluranimity.org>
* update channel handshake
Add ProvedID to ChanOpenTry which allows for flexible handshake identifier selection. Add CounterpartyChannelID to OpenAck. Update and add to handshake tests. Modify msgs_test. Counterparty ValidateBasic will return nil on an empty channel identifier to allow for flexible handshake identifier selection to succeed.
* Update x/ibc/core/04-channel/keeper/handshake.go
* add conn open init docs
* update docs for conn open try and conn open ack
* update channel docs