Currently `exec_query` raises `NoMethodError` when executing no result
queries (`INSERT`, `UPDATE`, `DELETE`, and all DDL) in mysql2 adapter.

```
irb(main):002:0> conn.execute("create table t(a int)")
   (43.3ms)  create table t(a int)
=> nil
irb(main):003:0> conn.execute("insert into t values (1)")
   (19.3ms)  insert into t values (1)
=> nil
irb(main):004:0> conn.exec_query("insert into t values (1)")
  SQL (28.6ms)  insert into t values (1)
NoMethodError: undefined method `fields' for nil:NilClass
```

add `constraint_to` option to SSL middleware

Update deprecation message shown when tasks from rails namespace are run

Fix formatting in Action Cable guide [ci skip]

Fix merge conflict in Action Cable guide [ci skip]

remove "rake" word [ci skip]

Fix typos in Action Cable guide [ci skip]

Guide for Action Cable

Ensure actioncable behaves as expected with non-string queues

use `app:update` instead of deprecated `rails:update` [ci skip]

`rails:update` was deprecated in 6fb31638

[ci skip] Add small Action Cable documentation fixes

* Fix typos/grammar errors
* Make capitalization/naming consistent

This guides were pointing to this command `rails app:update`, which I
tried to run, but it didnt worked. I think the right command is `rails
rails:update` instead. Also thats the name of the rake task.

Also I removed the `Rake` word from the title, as we run it using
`rails` bin now.

cc @kaspth
[skip ci]

remove rack cors initializer when updating

Use app namespace for framework tasks

[ci skip]Add info for specifying logger in different envrionments.

refer 2dc3e81a, 56ca2061

Rack cors initializer is only necessary to API-only applications, for when the update is unnecessary.

Create tmp folder if not present

All Apps may not have a tmp folder

Update dev.rake

Update dev.rake

Update dev.rake

Update dev.rake

Update dev.rake

Update dev.rake

Update dev.rake

Specify plaform: :mri for byebug

Revise #23717 (Add "Rendering ..." message) using proper ActiveSupport::LogSubscriber#start

Always use redis_connector to create redis connections 

We don't need to instrument another event as
`ActiveSupport::LogSubscriber` already tracks when the instrumentation
starts.

Close #23717

Added log "Rendering ...", when starting to render a template, to log that we have started to render something, at the very beginning.
This helps to easily identify queries from controller vs views

Fixes #23710

[close #23681] Use puma 3.0.0+

Puma 3.0 and up introduced compatibility to read from `config/puma.rb` when booting from the command `$ rails server`https://github.com/puma/puma/pull/856.