Handle the deprecated/schema properties that can exist on function-style rules

[bmish]

See:

• eslint-doc-generator/lib/generator.ts

  Line 94 in 663344b

  deprecated: false, // TODO: figure out how to access `deprecated` property that can be exported from function-style rules.

• prefer-object-rule should port over potential deprecated and schema properties from function-style rule eslint-community/eslint-plugin-eslint-plugin#311

Related:

• Drop support for deprecated, function-style rules #353