Fix type definitions

[deathaxe]

Description (e.g. "Related to ...", etc.)

This commit

• adds ClientInfo to InitializeParams
• adds HoverParams
• derives TextDocumentItem from VersionedTextDocumentIdentifier
• fixes some typos related with __init__.
• fixes In SymbolKindAbstract value_set should be a list type based on the spec. #122

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[danixeee]

@perrinjerome thanks for the help!

According to the specs, there are some new base types:

• WorkDoneProgressCreateParams
• WorkDoneProgressBegin
• WorkDoneProgressReport
• WorkDoneProgressEnd
• WorkDoneProgressCancelParams
• WorkDoneProgressParams
• WorkDoneProgressOptions
• PartialResultParams

So, HoverParams should extend WorkDoneProgressParams instead of adding a workDoneToken field. You do not have to add all of these types in this PR, maybe you can just remove self.workDoneToken = work_done_token from HoverParams and we can merge it.