feat/fix!: only support ESLint v9 and make fixes

[yusufkandemir]

Please see #350 for some relevant discussion.

Also contains two fixes:

• Properly get settings from the config array. Previously, when using an array configuration, settings would silently not get picked up.
• Correctly load parser. Previously, it only expected a string(path), whereas ESLint 9 expects an object.

There is an alternative to loading the config by monkey-patching, eslint/eslint#16806. So, we can make the processors accept globals and ignoreRules by wrapping them in a factory function. However, processors use the parser, which depends on parserOptions. So, we would either have to apply the same to parsers, or duplicate parserOptions definitions. We can likely export a helper function to compose the configuration and handle this accordingly, but it might be too much effort for something that's not mandatory right now. But, I wanted to document my thoughts and findings here.

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