Incorrect parsing of `import ..+`

[c42f]

Import paths with a prefixed pair of dots should parse as follows:

julia> JuliaSyntax.parse(SyntaxNode, "import ..A")
line:col│ tree                                   │ file_name
   1:1  │[import]
   1:7  │  [.]
   1:8  │    .
   1:9  │    .
   1:10 │    A

But for operators this doesn't work

julia> JuliaSyntax.parse(SyntaxNode, "import ..+")
line:col│ tree                                   │ file_name
   1:1  │[import]
   1:7  │  [.]
   1:8  │    ..+

This appears to be because the initial tokenize step picks the import path up as part of an invalid operator

julia> collect(JuliaSyntax.Tokenize.tokenize("..-"))
2-element Vector{JuliaSyntax.Tokenize.RawToken}:
 0-2        ErrorInvalidOperator
 3-2        EndMarker

Which is normally correct, but not helpful within import paths.

The reference parser also has this bug:

julia> dump(Meta.parse("import ..+"))
ERROR: Base.Meta.ParseError("invalid operator \"..+\" near column 9")