Chore: Add Typespec to all Functions/Arguments

[nelsonic]

I don't have time to do this right now but it's a really nice to have.

• See: https://hexdocs.pm/elixir/1.13/typespecs.html

[nelsonic]

Added to all functions. e.g:

gogs/lib/gogs.ex

Lines 150 to 161 in 578e956

	@spec commit(String.t(), map) :: {:ok, any} | {:error, any}
	def commit(repo_name, params) do
	repo = %Git.Repository{path: local_repo_path(repo_name)}
	# Add all files in the repo
	{:ok, _output} = Git.add(repo, ["."])
	# Commit with message
	{:ok, _output} = Git.commit(repo, [
	"-m",
	params.message,
	~s(--author="#{params.full_name} <#{params.email}>")
	])
	end

Definitely a nice-to-have. But ticks the box. ✅