Use Float.{to_string/1, to_charlist/1} when possible

[MikaelFangel]

This is a suggestion to use the Float.to_string/1 and Float.to_charlist/1 functions in the String.Chars and List.Chars protocols. Furthermore, it also changes Inspect to use Float.to_charlist/1. The reasoning behind is consistency, so the functions match the others in the protocols.

This PR, updates the functions in the same places as updated in #13046 except for in Float itself.

The changes all refer to these lines in Float:

elixir/lib/elixir/lib/float.ex

Line 602 in ed75e60

:erlang.float_to_list(float, [:short])

elixir/lib/elixir/lib/float.ex

Line 631 in ed75e60

:erlang.float_to_binary(float, [:short])

[josevalim]

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