Update annotationsPositionalArguments test

See (`module ceylon.language`) works now – AST-wise, 'ceylon.language'
is an ImportPath here, and imports are now implemented.
Implement rest of meta literals

Meta literals can be a little more complicated than I originally
anticipated.
Implement WithinOps

    1 < 2 <= 3

The grammar of these is a bit crazy... the operator tokens are lost, and
instead the information "< vs <=" is only preserved in the bounds being
OpenBounds or ClosedBounds (by type).
Implement TypeOperatorExpressions

    val is Type, val of Type|OtherType

additionally:

    val satisfies Type, val extends Type

which are allowed in the grammar, but not actually a thing (you get an
error saying they’re “not yet supported”) (introduced in
ceylon/ceylon-spec@3323364). As the formatter only cares about the
syntax of the code, and not the semantics, we support these too!