Allow configuring indentation size

[JohanBeekers]

In our project, we use 4 spaces as indentation size for pretty much all json and ts files. The auto formatter automatically formats these files with 4 spaces. And so does another tool that some people in our project are currently still using. i18n Ally saves the translation json files with 2 spaces of indentation. While this might not always be a problem, merge conflicts seem to occur more often and indicate the entire files as conflicting.
I would love a setting to configure the space indentation size.

[antfu]

In v1.4.2, you can set it by

"i18n-ally.indent": 4

[JohanBeekers]

Seems to work perfectly.
And that was really fast too. You are absolutely great!