Deprecate logging methods on Moduleinstances

[eritbh]

Module-related code that needs to use logging facilities is increasingly located in free functions which don't have the Module instance in scope, and manually saving the instance as a self variable just to use logging functionality feels weird and self-referential. Instead let's just have module files create their own TBLog instances and call log functions on those.

Once this is done we can remove the cheeky Object.assign() bits of logging-related code which set the logging methods on modules, and also the bit that causes the exported TBLog function to also work as a "default logger" with no caller (since everyone creating their own logger instances will always specify a caller).

Related to 9519582