Extension info, not work with macros `maybe`

## Describe the bug

`UserSchema.info` raised an error if schema has `.maybe`

## To Reproduce

```ruby
UserSchema = Dry::Schema.JSON do
optional(:age).maybe(:integer)
end
UserSchema.info
```
```
undefined method `visit_not' for #
Did you mean? visit_and
visit_set
visit_key
lib/dry/schema/extensions/info/schema_compiler.rb:46:in `public_send'
lib/dry/schema/extensions/info/schema_compiler.rb:46:in `visit'
lib/dry/schema/extensions/info/schema_compiler.rb:74:in `block in visit_implication'
```

## Expected behavior

A clear and concise description of what you expected to happen.

## My environment

- Affects my production application: **YES**
- Ruby version: 2.7
- OS: linux

Start with lib/dry/schema/extensions/info/schema_compiler.rb:46, where the reported visit_not dispatch fails, then reproduce the issue with the UserSchema.info example using optional(:age).maybe(:integer). Done means UserSchema.info completes without raising for schemas using maybe; check the existing info extension tests for the expected output.

Written by the indexing model from the issue text.