Add support for service descriptions to include white spaces and new line when displayed in the UI

[bostonswe92]

Currently when writing the description for a service, or the description for the service fields/parameters, HA trims all new lines and white spaces in the UI description text box , leaving the description one long unformated text line.

If you have a lot of options to describe, or if you have a parameter with its own sub-parameters, your description will look very cluttery in the UI. This basicly only leaves you with the option to have a minimal description in the UI and refer the user to a wiki site.

Allowing for multiple lines in the description allows developers to better document the service directly in the home assistant UI, in a more readable way. Its never a bad thing to bridge the gap between the user and the documentation.

Example code for a field/parameter description and desired output in the UI:

fields:
    My_parameters:
       description: | 
            My_parameter have 2 sub_parameters:   sub_parameter_1 and sub_parameter_2
            - Sub_parameter_1 options: example_value_1, example_value_2, example_value_3, example_value_4 and example_value_5
            - Sub_parameter_2 options: example_value_6 and example_value_7
         example: |
             Sub_parameter_1: example_value_1 
             Sub_parameter_2: example_value_6

What a possible desired output could look like in the UI text box(including an imagined automatic line break due to textbox size):

My_parameter have 2 sub_parameters: sub_parameter_1 and sub_parameter_2
- Sub_parameter_1 options: example_value_1, example_value_2, example_value_3, example_value_4
and example_value_5
- Sub_parameter_2 options: example_value_6 and example_value_7

Clicking on the "FILL EXAMPLE DATA" button would fill in the following yalm code:

  My_parameters:
      Sub_parameter_1: example_value_1
      Sub_parameter_2: example_value_6

I do belive its only a matter of removing some trim functionallity that is currenly in place for the UI description text box. Currently the "example" parameter works like shown above (no white space/new lines are removed) so it must be some specific formatting that is applied to the description text box.

I do understand that everyone UIs and screen are diffrent size, so that might mess up any formatting you do to the description anyway. But allowing white spaces and new lines does not remove the ability to make the description display as it does today, if so desired. It only allows for more option for developers, if they want to use it.