Implement a rule that checks naming scheme consistency

[illright]

Originally intended for #8, I thought it might be better to implement it as a generic/built-in/something rule, similar to circular imports, instead of keeping it in the FSD plugin.

Check that all folders in the project use a consistent naming scheme and that all files have consistent separators

Example of a valid, consistent project:

• 📂 users/
  • User.tsx
  • index.tsx
• 📂 better-users/
  • BetterUser.tsx
  • getDate.tsx
  • lib.d.ts

Bad example:

• 📂 folderOne/
  • some_file.tsx
  • other file.tsx
  • ExtraComponent.tsx
• 📂 folder-Two/
  • ComponentOne.tsx
  • Component-Two.tsx
  • get-something.ts
  • 📂 folder_three/