Support extends in buildFromOxlintConfigFile

[ValentinGurkov]

Hello,

Thank you for providing this plugin, it makes the transition to oxlint much smoother!
We use oxlint in a monorepo scenario where we extend a base configuration. I debugged buildFromOxlintConfigFile and found that it only reads info about rules, plugins etc. from the current config and doesn't follow through the chain of extends.
There is a pretty simple workaround by also adding another line of buildFromOxlintConfigFile with the base config, though I was wondering if supporting extends is something you'd be interested in?

[Sysix]

though I was wondering if supporting extends is something you'd be interested in?

Yes, we want to support this. extends came later, and I had no time to implement it.
Feel free to create a PR :)

[yunarch]

@ValentinGurkov We also need this feature so I have created a PR #419 with an initial implementation

@Sysix The implementation can be improved, but I think is a starting point 😄