Fix handle resolve multiple methods

[snutij]

Motivation

Closes: #1343

Implementation

When we invoke resolve_method, do not pick only the first match, bot return an array containing all matches.

• replace find by select
• return an empty array when nothing match (feel free to challenge this point, as the interface change)

Handle in all requests using this resolve following advices:

• merge documentation for hover
• push all Location for definition
• merge documentation for signature help

Question: On signature_help request, we could propose multiple signatures, with for each signature information the related documentation and parameters. I did a try, it changes the interface, to allow user changing signature with arrow. You can find an example from VS Code documentation here. Do you think it can be better or bring some unwanted complexity? Idk how it's handled by other IDE.

Automated Tests

Added tests in all request and indexer, again, if missed some useful cases, just say it 👍

Manual Tests

Given this code:

# file 1
module Func
  def start
    something()
  end

  # Does something interesting
  def something(argument_name)
    puts argument_name
  end
end

# file 2
module Func
  # Does something interesting
  def something(argument_with_other_name)
    puts argument_with_other_name
  end
end

For hover on something:

For go to definition on something:

For signature_help on something:

[vinistock]

This looks great!

[vinistock]

Awesome! 🚀