[ruby/irb] Refactor RubyLex and its tests

(https://github.com/ruby/irb/pull/427)

* Make sure `RubyLex#set_input`'s context is always present in tests

In real-world scenarios, the context should always be non-nil:
https://github.com/ruby/irb/blob/master/lib/irb.rb#L489

So we should make sure our test setup reflects that.

* Make context a required keyword

Since in practice, `set_input`'s context should always be non-nil, its
parameters should reflect that.

And since `RubyLex#check_state` is only called by `#lex` and
`#set_input`, both of which now always require context, we can assume
its context should be non-nil too.

https://github.com/ruby/irb/commit/1aeeb86203

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