Enhance Lua debugging output.

Don't use "debug" as the name of a function to conditionally write debug
messages: "debug" is a Luau built-in library, and assigning that name locally
would shadow the builtin. Use "dbg" instead.

Recast fiber.print_all() as fiber.format_all() that returns a string; then
print_all() is simply print(format_all()). This refactoring allows us to use
dbg(format_all()) as well.

Add a couple new dbg() messages at fiber state changes.

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