GreenNode equality and hashing mismatch

[LilithHafner]

julia> x = JuliaSyntax.parse(JuliaSyntax.GreenNode, "1 + 1")
     1:5      │[call]
     1:1      │  Integer                ✔
     2:2      │  Whitespace
     3:3      │  +                      ✔
     4:4      │  Whitespace
     5:5      │  Integer                ✔


julia> y = JuliaSyntax.parse(JuliaSyntax.GreenNode, "1 + 1")
     1:5      │[call]
     1:1      │  Integer                ✔
     2:2      │  Whitespace
     3:3      │  +                      ✔
     4:4      │  Whitespace
     5:5      │  Integer                ✔


julia> x == y
true

julia> hash(x) == hash(y)
false

This makes Dicts broken.