Remove DecoratedStatement, store decorators as a flat list in statement nodes

[berekuk]

This is done on top of #3312. It fixes an annoying workaround in syntax highlighting there, as well as simplifies some other things.

The basic idea is the following: previously, we parsed @hide @name("foo") x = 5 as DecoratedStatement decorator (DecoratedStatement decorator (LetStatement x 5)). Now we store it as (LetStatement x 5 [decorator list]).

The benefits:

• we don't have to unwrap decorator statements in several places in our codebase
• styling in components is simplified and more robust

There are some minor user-facing consequences from this:

• when you click on the variable name in viewer, the position in the editor will include the full AST node, including the decorators
• Tag.location also stores the full AST node location, starting from the first decorator (in fact, the assignment without decorators doesn't even have its own location now; but you can extract the value or variable node from it trivially, if necessary)

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Latest commit: f5aea2c596e6a5a490365715a2a60cd59aa141bf

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