These config values are relatively static but in some cases they can be called many times in the same request (like rendering a report or a large list of line_items in BOM). These values will now only get fetched from Redis/Postgres once at most per request/job.
This fixes the following deprecation warning
```
[DEPRECATION] `html` is deprecated - use `html_wrap` instead. Please
note that `html_wrap` will wrap all parts of currency and if you use
`with_currency` option, currency element class changes from `currency`
to `money-currency`.
```
This removes millions of deprecation warnings like the following
```
[DEPRECATION] `symbol_position: :before` is deprecated - you can replace it with `format: %u %n`
```
from the build. It gets printed every time a `Spree::Money` is instantiated.
This should result in a non-negligible speed up of the test suite.
This is already tested by the top-most before block and besides, we
there's no OFN in Japan. We don't need to test all supported currencies
but ensure that the various arguments work as intended.
