Introducing solargraph.

I am thinking that introducing solargraph is also good.
I tried implementing hover with solargraph in my repository.
The following is the change.

I would be happy if you give me opinions.

@steiley

Thank you for giving me your opinion!

I'm positive to introduce new tools to make the ruby language server better 👍
But I haven't used Solargraph so let me try it.

And sorry, currently I'm mainly focusing e2e test to make sure #44 is fixed.
It will take a while 💦

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