fix(linter/plugins): replace Context class (#15448)

Fix #15325.

Some ESLint rules create a wrapped copy of `context`, in order to patch `report` and pass that wrapped context object to another rule.

Some rules also rely on unspecified details of ESLint's implementation - that `context` is formed of 2 layers - top layer being `RuleContext` (`id`, `report` etc), and bottom layer being `FileContext` (`filename`, `sourceText` etc).

This usage was broken in our implementation because:

1. We collapsed the 2 layers into 1.
2. We used a `Context` class which stored its internal data in a private property. When `context.report` was called with a different `this`, it failed because the private property couldn't be accessed from an object which isn't an instance of the class.

Fix this problem by:

1. Splitting `Context` into 2 layers like ESLint does.
2. Not using classes or private properties.
3. No methods/getters on context objects use `this`.

We now have:

* Separate `Context` object per rule, containing properties related to the rule - a plain object which uses data from closure scope.
* All rule `Context`s inherit from the same singleton `FILE_CONTEXT` object, which provides getters for properties related to the file (same for all rules).

Tests adapted from #15326.

Author: overlookmotel

apps/oxlint/package.json

@@ -44,6 +44,7 @@
     "execa": "^9.6.0",
     "jiti": "^2.6.0",
     "tsdown": "catalog:",
+    "type-fest": "^5.2.0",
     "typescript": "catalog:",
     "vitest": "catalog:"
   },