Write annotations of constant, global, and class/module alias declarations

[ksss]

RBS::Writer#write_decl does not call write_annotation for Constant, Global, ClassAlias, and ModuleAlias, so annotations on those declarations are dropped when writing.

_, _, decls = RBS::Parser.parse_signature("%a{deprecated}\nclass A = B\n")
RBS::Writer.new(out: $stdout).write(decls)
# => class A = B

Cause

#2302 made these declarations annotatable (6f8d0f3 for class/module aliases, 1bc9bb4 for globals, 075d27c for constants), but those commits only changed the AST and the parser. The writer was never updated.

Change

Each branch now calls write_annotation decl.annotations right after write_comment, the same way TypeAlias, Class, Module, and Interface already do.

Notes

• The constant and global cases in the test have no comment above the annotation. On current master the parser drops such a comment for these two declarations; Attach comments above annotations to constant and global declarations #3245 fixes that. Once Attach comments above annotations to constant and global declarations #3245 is merged, comments can be added to those cases.
• The blank lines between the top-level declarations in the test are deliberate. Writer#preserve_empty_line doesn't consider annotations, which lie outside the declaration's location, so the writer inserts a blank line before any annotated declaration that has no comment. This already happens for TypeAlias and Class today, and it is left for a separate change.

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