Swap the vertex naming convention of `inner_network`

Currently in inner_network, bra vertices are given the name (v, 1) and ket vertices are given the name (v, 2), for example:

julia> x = random_ttn(siteinds("S=1/2", path_graph(3)))
TreeTensorNetwork{Int64} with 3 vertices:
3-element Vector{Int64}:
 1
 2
 3

and 2 edge(s):
1 => 2
2 => 3

with vertex data:
3-element Dictionaries.Dictionary{Int64, Any}
 1 │ ((dim=2|id=808|"S=1/2,Site,n=1"),)
 2 │ ((dim=2|id=193|"S=1/2,Site,n=2"),)
 3 │ ((dim=2|id=123|"S=1/2,Site,n=3"),)

julia> inner_network(x, x)
ITensorNetwork{Tuple{Int64, Int64}} with 6 vertices:
6-element Vector{Tuple{Int64, Int64}}:
 (1, 1)
 (2, 1)
 (3, 1)
 (1, 2)
 (2, 2)
 (3, 2)

and 7 edge(s):
(1, 1) => (2, 1)
(1, 1) => (1, 2)
(2, 1) => (3, 1)
(2, 1) => (2, 2)
(3, 1) => (3, 2)
(1, 2) => (2, 2)
(2, 2) => (3, 2)

with vertex data:
6-element Dictionaries.Dictionary{Tuple{Int64, Int64}, Any}
 (1, 1) │ ((dim=2|id=808|"S=1/2,Site,n=1"),)
 (2, 1) │ ((dim=2|id=193|"S=1/2,Site,n=2"),)
 (3, 1) │ ((dim=2|id=123|"S=1/2,Site,n=3"),)
 (1, 2) │ ((dim=2|id=808|"S=1/2,Site,n=1"),)
 (2, 2) │ ((dim=2|id=193|"S=1/2,Site,n=2"),)
 (3, 2) │ ((dim=2|id=123|"S=1/2,Site,n=3"),)

I think it would be nicer if this convention was reversed.

Start by locating the inner_network entry point and inspect how it assigns tuple names to bra and ket vertices. Reverse the convention so bra vertices use (v, 2) and ket vertices use (v, 1), then verify that the resulting network has the expected vertex names and edges.