Vaguely named consumer structs

[shaspitz]

Problem

Following the merge of #1071, the consumer's GenesisState and Params will now live in the shared /x/ccv/types directory, as they should be (ie. they're reffed by both consumer and provider). These two structs should now be named ConsumerGenesisState and ConsumerParams since the package alias will no longer indicate the structs are relevant to consumer.

For consistency, we could also refactor the provider structs to be ProviderGenesisState and ProviderParams, although this isn't strictly neccessary as those structs still live in x/ccv/provider.

Closing criteria

Refactor names according to above.