Add on-hover details for types

[awerment]

Hello! 👋

Been bugged by the fact that type specs are not displayed in the on-hover windows and decided to try and change that.

This PR adds more details:

• includes type spec
• includes full type signature, e.g. GenServer.on_start() instead of just on_start
• includes link to erlang/hexdocs documentation

Examples

Elixir before

Elixir after

Erlang before

Erlang after

[CLAassistant]

All committers have signed the CLA.

[jonatanklosko]

Awesome, thanks! Just a couple nitpicks :)

[github-actions]

Uffizzi Preview deployment-28237 was deleted.

[jonatanklosko]

🐈

[awerment]

@jonatanklosko Just now noticed that the additions do not apply for the details of autocomplete suggestions. Should I take another look at that?

[jonatanklosko]

@awerment yes, please! It should be a matter of adjusting this:

livebook/lib/livebook/intellisense.ex

Lines 255 to 267 in 7691324

	defp format_completion_item(%{
	kind: :type,
	name: name,
	arity: arity,
	documentation: documentation
	}),
	do: %{
	label: "#{name}/#{arity}",
	kind: :type,
	detail: "typespec",
	documentation: format_documentation(documentation, :short),
	insert_text: Atom.to_string(name)
	}