`define_accessors` eval block consumes nonsensical values

[Slotos]

Describe the bug

Dry::Struct::ClassInterface#define_accessors naively consumes attribute value in eval block.

If the name contains a single space, second word becomes a parameter.
If argument contains special symbols, SyntaxError is raised.

To Reproduce

require 'dry-types'
require 'dry-struct'

module Types
  include Dry.Types()
end

class Line < Dry::Struct
  attribute :'test string', Types::String  
end

Line.new('test string': '42').test # => ArgumentError: wrong number of arguments (given 0, expected 1)

class Handlebar < Dry::Struct
  attribute :'{test}', Types::String.optional.default(nil)
end # => raises SyntaxError

Expected behavior

Direct accessor methods are only created if the attribute name is a valid method name.
By default, a specific error is raised for names that don't fit the criteria. Option to skip accessor creation is available.

My environment

• Affects my production application: NO
• Ruby version: 2.6.6, 2.7.3