Why:
These methods are used internally for the functionality of the library
and are subject to change. Therefore shouldn't be part of the public
interface.
This PR:
- Moves the ```register_strategy```, ```register_callback```,
```register_default_factories```, ```register_default_callbacks```
```strategies```, ```callback_names```
and ```strategy_by_name``` methods to the ```FactoryBot::Internal```
class.
- Deprecates the use of ```register_callback``` from the ```FactoryBot```
module.
Why:
Another run of internal methods that should not be publicly
available from the base namespace.
This time the sequence involving methods were moved. It's worth noticing
that the ```Internal``` class is getting crowded. Maybe we can start
name-spacing the internal groups into modules under
```internal/sequence.rb``` ```internal/trait.rb``` and so on. Thoughts?
This PR:
- Moves the ```register_sequence```, ```sequence_by_name```,
```sequences``` and ```rewind_sequences``` to the
```FactoryBot::Internal``` module.
- Deprecates uses of ```sequence_by_name```, and ```sequences```
from the ```FactoryBot``` module.
- Refactor rewind sequences test to use spies
This is one of the steps towards fixing [this
issue](https://github.com/thoughtbot/factory_bot/pull/1285#1281)
FactoryBot::Syntax::Methods was missing some documentation on
the *_pair methods. This adds in the documentation and
corresponding method directives.
Further, add the missing &block parameter to the existing *_list directives.
We decided not to included documentation for the `null` strategy,
since this strategy is used internally, and only returns `nil`. There isn't
much point in documenting it and making it available.
