Add level-method to represent CCTX state transition

[lumtis]

This is a preliminary task in preparation of #1800 and #1801, this can also be directly implemented in one of the PR above.

We have currently directly manipulate with the CCTX object in the voteInbound/voteOutbound logic when adding for example adding new outbound parameter for regular outbound or revert. We should break down the general state transition of CCTX in small low level method that can be easily tested and reused.

These methods should be ideally stateless, only interacting with the CCTX object passed as argument, for reliable testing (in the types package)

We should remove the CreateNewCCTX currently in the keeper package

Example of methods:

func InitializeCCTX(inboundParameter) CCTX
func (cctx CCTX) AddOutbound(outboundParameter) CCTX
func (cctx CCTX) AddRevertOutbound(outboundParameter) CCTX
func (cctx CCTX) Abort(outboundParameter) CCTX

The logic can also be simplified in evm-hook.go when creating new CCTX upon observed events on ZetaChain.
Right now we call we create an artificial MsgVoteOnObservedInboundTx message by calling NewMsgVoteOnObservedInboundTx to initialize the inbound, which is very dirty and confusing.

[lumtis]

@kingpinXD did you start working on #1800 and #1801?
I think exploring this refactoring first might make more sense

[lumtis]

Closing as resolved #1853