Rename dependencies.rake to cache_digests.rake

As the tasks are related to cache_digests and 
as they are already namespaced under cache_digests,
renaming to cache_digests.rake makes it to know
where to find these tasks.

Remove passing `with_dispatchers` to AppGenerator

Job payload should be symmetric across JSON dump/load

use same name to type object

Placing non-native JSON data types, like symbols, in the hash to serialize means that the deserialize method will return something different from what was serialized, a common bug and source of frustration for devs.

This method will only be added when used with Ruby 2.3.0 or greater.
This method has the same behavior as `Hash#dig`, except it will convert
hashes to `ActionController::Parameters`, similar to `#[]` and `#fetch`.

AppGenerator: allow both 'rake' and 'rails'

Pass headers through to payload for logging.

This commit comes from the comments made by @matthewd at https://github.com/rails/rails/pull/23795/files#r54469637
and by @rafaelfranca at https://github.com/rails/rails/pull/23795/files#r54609364

The idea is that if you type (for example) "rake db:migrate" in an AppGenerator,
then this should actually invoke `rake db:migrate` on the command line, whereas
if you type "rails_command db:migrate", this should invoke `rails db:migrate`.

- While working on https://github.com/rails/rails/pull/22790 I found out
  that we pass `with_dispatchers: true` but it's not used at all by Rails.
- We were passing `with_dispatchers: true` in few tests too but again
  it's not used by Rails.

Follow up to #24079

Make request headers available in the event payload so that it is available to attached ActionController::LogSubscribers.

Remove redundant regexp escapes in generators

Execute default_scope defined by abstract class within the scope of subclass

Friendly error message if missing `listen` development dependency

Advertise the console web-console feature

Optimize url helper

Fix the tests after #24104

In the latest version of Web Console, you can call `console` anywhere in
your application and get a console with that binding in it. I think this
is worth advertising, as it may be useful to do outside of controllers
and views.

[ci skip]

reduce string allocation.
- Use freezed empty string instead of create one every time we need to return it

Drop the explicit version requirements for web-console

Between major versions 2 and 3, we hit a bug. It's fixed in version 3,
however, the explicit 2.x requirement of `~> '2.0'` will prevent people
from getting the fix with `bundle update` and they would have to
explicitly set the constraint to `~> '3.0'`.

For more information see: rails/web-console#178.

I propose we drop the explicit version constraints in the Gemfile. Web
Console has been relatively stable for the past couple of years, and I
don't anticipate any major alterations, like we saw between major
versions 1 and 2.

Remove extra 'the' and unwanted comma [ci skip]

Remove outdated comment [ci skip]

related to #19324 and #18606

[skip ci]

extract ActionDispatch::IntegrationTest::Behavior

Fixes funny spelling in an AR test

Similar to 176fbfd6, this makes it possible for other test
frameworks to hook into Rails integration test facilities.

Remove incorrect Rack documentation example