Re-factor ConsensusContext Validate functions to remove the fake "context"

[noambergIL]

The validations here have a context that holds data and then used to have all the functions conform to same sig - somewhat nicer in the main func and maybe to cluster the tests.

However its not flexible, its weird to copy data just to have a single sig for funcs and anyways i've added functions that just don't conform.

Consider removing the rxValidtorContext and txValidatorContext and just calling the functions with the data they need.