Extract ActiveSupport::NumberHelper methods to classes

Due to the overall complexity of each method individually as well as the
global shared private module methods, this pulls each helper into it's
own converter class inheriting from a generic `NumberBuilder` class.

* The `NumberBuilder` class contains the private methods needed for each helper
method an eliminates the need for special definition of specialized private
module methods.
* The `ActiveSupport::NumberHelper::DEFAULTS` constant has been moved
into the `NumberBuilder` class because the `NumberBuilder` is the only
class which needs access to it.
* For each of the builders, the `#convert` method is broken down to
smaller parts and extracted into private methods for clarity of purpose.
* Most of the mutation that once was necessary has now been eliminated.
* Several of the mathematical operations for percentage, delimited, and
rounded have been moved into private methods to ease readability and
clarity.
* Internationalization is still a bit crufty, and definitely could be
improved, but it is functional and a bit easier to follow.

The following helpers were extracted into their respective classes.

* `#number_to_percentage` -> `NumberToPercentageConverter`
* `#number_to_delimited` -> `NumberToDelimitedConverter`
* `#number_to_phone` -> `NumberToPhoneConverter`
* `#number_to_currency` -> `NumberToCurrencyConverter`
* `#number_to_rounded` -> `NumberToRoundedConverter`
* `#number_to_human_size` -> `NumberToHumanSizeConverter`
* `#number_to_human` -> `NumberToHumanConverter`
Add regression test for IpSpoofAttackError issue

See #10780
activemodel isn't a runtime dependency for actionview
Make the tests break again

We need to fix this test
Unify cattr and mattr accessors declarations
Make the release notes consistent [ci skip]

Conflicts:
	guides/source/4_1_release_notes.md
:scissors:

[ci skip]
Use alphabetic order

[ci skip]
Add documentation about the Action Dispatch salt configuration

[ci skip]
Wrap 80 columns [ci skip]
Merge pull request #11197 from gsamokovarov/unify-mattr-cattr

Unify cattr and mattr accessors declarations
Make ActionView::Tags loading tread safe
Remove deprecated cattr_* requires
Add number and range field to form helpers article

Also wrap surrounding text to 80 chars.

[ci skip] Closes #13132
Merge pull request #13138 from gsamokovarov/remove-cattr-requires

Remove deprecated cattr_* requires
Merge pull request #10996 from mattdbridges/number-helper-refactor

Refactor and clean up number helpers

Conflicts:
	activesupport/lib/active_support/number_helper.rb
Fix note about class attribute accessors deprecated file [ci skip]
Remove dead comment from AS extensions guide [ci skip]
Remove note about removed local_constant_names method from guides [ci skip]
Make load of NumberHelper thread safe