feat: add plural support

[jkalberer]

Internal Release Notes

This PR does a few things

1. Support count and ordinal for i18n t function. This does not add support on Trans components because there wasn't a good example on what properties to set to support defaults
2. Remove the opinionated logic around ***_one derived keys. These were being set as "not derived" and given specific logic to populate them with default values. This doesn't make a lot of sense since we generally will want to add values to all derived keys or none of them.
3. Derived keys no longer use key instead of cleanKey when setting the default value. This means that you'll end up with keys/value mapping

"key_one" => "key"
"key_other" => "key"

instead of

"key_one" => "key_one"
"key_other" => "key_other"

I can't think of any case where I'd want to map the key to value like this. It's better to use the key as the fallback because if you have keyAsDefaultValue set, you want the keys to actually work as translations.

Validation Steps

yarn run test

[jkalberer]

This resolves #207 and #167

[gilbsgilbs]

Thank you for this work. The PR is not too large so that's fine, but I'd appreciate more atomic PRs in the future, because my brain is no longer "hot" on that project. Anyways.

Remove the opinionated logic around ***_one derived keys. These were being set as "not derived" and given specific logic to populate them with default values. This doesn't make a lot of sense since we generally will want to add values to all derived keys or none of them.

I don't want to bikeshed this and I don't have strong feeling against it, but as it is sort of a breaking change (arguably one I'd be fairly confident making without a major version bump), I'd prefer stronger incentives. I can't say I'm very convinced by the "it clearly doesn't make sense because generally <some projection on what people are doing>" take…

Why did you implement it? Did it make code easier to write? Do you consider the old behavior a bug? I don't really see what value this change brings.

[gilbsgilbs]

This comment should be amended accordingly.

[gilbsgilbs]

Please, keep this in your local ignore config.