Add oppurtunity to configre yarn global folder globally

[glensc]

there's support for local .yarnrc for configuring:

• change yarn global dir - I can not change the yarn global installation folder #5746 (comment)

but that is not sufficient, it needs to be global config:

• change yarn global dir - I can not change the yarn global installation folder #5746 (comment)

because .config/yarn/global (XDG_CONFIG_HOME) is wrong path for such purpose by XDG spec, I want to re-configure it to be .cache/yarn/global (XDG_CACHE_HOME) or at least .local/share/yarn/global (XDG_DATA_HOME)

[anka-213]

I think it is actually the correct place for the package.json and yarn.lock files, since the list of installed packages is a form of configuration.

However, it is definitely not the correct place to actually install the packages. I think the default should change in addition to it being configurable.