Provide quick fixes for error/warning messages

Idea

Attach recommended fixes to error/warning messages that can be solved "easily", e.g.:

• Unused variables/type parameters/imports
  • This could have multiple 'fixes':
    • Remove the variable
    • Rename the variable to _ in the case of parameters
    • Prefix the variable with _ if #135 were to be implemented etc.
• Duplicate imports
• Required (but undeclared) language extensions
• Redundant (implied) language extensions
• Missing top-level type signatures
• Uninitialized record fields (see #125)
• Unused do-bindings (see #134)
• Migrations in the case of source breaks (e.g. if #135 were to be implemented)
• Case mode rename suggestions
• etc.

Motivation

Having a unified solution for attaching fixes to a message, would make it easy to emit messages like this one from GHC:

import Prelude (True)

src/ImportSyntaxCheck/ImportDataConstr.hs:1:17: error:
    In module ‘Prelude’:
      ‘True’ is a data constructor of ‘Bool’
    To import it use
      import Prelude( Bool( True ) )
    or
      import Prelude( Bool(..) )
  |
1 | import Prelude (True)
  |                 ^^^^

This would also enable downstream features like language server support for fixable errors and subsequently improve the editing experience for Curry in LSP-supporting editors, as in this Rust example: