Add a description option to checks

[timlandolt]

When a check times out or raises an error, the make_sure message can't be displayed. Also, there's no way to add some kind of message to expects. While searching for a solution, I came up with the idea of a check description.
The newly added check description enables you to set a custom description (including formatting) to a check that will be shown no matter the result of the checks/expects.

Darkmode

# config/allgood.rb

check "DB Connection", description: "Testing the db connection.<br> <b>Wow, I'm bold</b>" do
  make_sure ActiveRecord::Base.connection.connect!.active?, "I will be shown because all went well"
end

check "DB Connection", description: "This messages will be shown" do
  # raise error
  make_sure 1 > "1", "This message won't be shown"
end

check "DB Connection", description: "This messages will be shown" do
  sleep 20 # force a timeout
  make_sure ActiveRecord::Base.connection.connect!.active?, "This message won't be shown"
end

# No description box will be shown

check "DB Connection", description: "" do
  make_sure ActiveRecord::Base.connection.connect!.active?
end

check "DB Connection" do
  make_sure ActiveRecord::Base.connection.connect!.active?
end