Track Progress of lib9c Action for Avatar Battle Result Recording

[Atralupus]

We need an action that simply conducts a battle between Avatar A and Avatar B and records only the result on the chain, unlike the current Arena battles that track tickets and wins/losses.

The action should include an argument to add metadata for verifying that the TX was requested by the ArenaService.

Since this needs to be implemented in lib9c, the detailed issue will be created there. This issue will only track and verify its progress.

[Atralupus]

planetarium/lib9c#3089