SyntaxNodes are never equal

[LilithHafner]

Because they use the === fallback, SyntaxNodes are never equal, even when they are semantically equivalent. For example,

julia> x = JuliaSyntax.parse(Expr, "1+1 == 2")
:(1 + 1 == 2)

julia> y = JuliaSyntax.parse(Expr, "1+1 == 2")
:(1 + 1 == 2)

julia> x == y
true

julia> x = JuliaSyntax.parse(SyntaxNode, "1+1 == 2")
line:col│ tree                                   │ file_name
   1:1  │[call-i]
   1:1  │  [call-i]
   1:1  │    1
   1:2  │    +
   1:3  │    1
   1:5  │  ==
   1:8  │  2


julia> y = JuliaSyntax.parse(SyntaxNode, "1+1 == 2")
line:col│ tree                                   │ file_name
   1:1  │[call-i]
   1:1  │  [call-i]
   1:1  │    1
   1:2  │    +
   1:3  │    1
   1:5  │  ==
   1:8  │  2


julia> x == y
false

It'd be nice if I could check if two things parsed equally using ==.