add mutation set and mutation schema to kwargs-syntax

[elbow-jason]

add mutation set and mutation schema to kwargs-syntax

[elbow-jason]

Also mutation delete.

[elbow-jason]

mutation set and mutation schema add in commit b45e4bb

[elbow-jason]

added mutation delete in 87c76f3

test "mutation set works" do
    assert mutation([
      set: %Person{
        name: "jason",
        age: 33,
      }
    ])
    |> render
    |> clean_format == clean_format("""
      mutation {
        set {
          _:person <name> \"jason\"^^<xs:string> .
          _:person <age> \"33\"^^<xs:int> .
        }
      }
    """)
  end

  test "mutation schema works" do
    assert mutation([
      schema: Person
    ])
    |> render
    |> clean_format == clean_format("""
      mutation {
        schema {
          name: string .
          age: int .
          works_at: uid .
        }
      }
    """)
  end

  test "mutation delete works for a field" do
    assert mutation([
      delete: field(uid("1234567"), "*", "*")
    ])
    |> render
    |> clean_format == clean_format("""
      mutation {
        delete {
          <1234567> * * .
        }
      }
    """)
  end


  test "mutation delete works for tuple of fields " do
    assert mutation([
      delete: {
        field(uid("1234567"), "*", "*"),
        field(uid("1234567890"), "*", "*"),
      }
    ])
    |> render
    |> clean_format == clean_format("""
      mutation {
        delete {
          <1234567> * * .
          <1234567890> * * .
        }
      }
    """)
  end

  test "a complex mutation" do
    assert mutation([
      delete: {
        field(uid("0x123"), :name, "Jason"),
      },
      set: %Person{
        name: "Not Jason",
      },
      schema: Person,
    ])
    |> render
    |> clean_format == clean_format("""
      mutation {
        delete {
          <0x123> <name> \"Jason\" .
        }
        set {
          _:person <name> \"Not Jason\"^^<xs:string> .
        }
        schema {
          name: string .
          age: int .
          works_at: uid .
        }
      }
    """)
  end