Why this change?
This is a follow-up to 86b2e3aa3e.
Basically, we want to allow people to select more than 1 category as well.
What does this change do?
1. Change `type: category` to `type: categories` and support `min` and `max`
validations for `type: categories`.
2. Fix the `<SchemaThemeSetting::Types::Categories>` component to support the
`min` and `max` validations and switch it to use the `<CategorySelector>` component
instead of the `<CategoryChooser>` component which only supports selecting one category.
Why this change?
While working on the tag selector for the theme object editor, I
realised that there is an extremely high possibility that users might want to select
more than one tag. By supporting the ability to select more than one
tag, it also means that we get support for a single tag for free as
well.
What does this change do?
1. Change `type: tag` to `type: tags` and support `min` and `max`
validations for `type: tags`.
2. Fix the `<SchemaThemeSetting::Types::Tags>` component to support the
`min` and `max` validations
Why this change?
In our schema, we support the `min_length` and `max_length` validation
rules like so:
```
some_objects_setting
type: objects
schema:
name: some_object
properties:
title:
type: string
validations:
min_length: 1
max_length: 10
```
While the validations used to validate the objects on the server side,
we should also add client side validation for better UX.
Why this change?
When editing a objects typed theme setting, the input fields which are
rendered should include a description so that the user knows the purpose
of the field which they are changing.
What does this change do?
This change adds support for adding description to each property in the
schema for an object by following a given convention in the locale file.
For a schema like this:
```
objects_setting:
type: objects
schema:
name: section
properties:
name:
type: string
required: true
links:
type: objects
schema:
name: link
properties:
name:
type: string
required: true
validations:
max_length: 20
url:
type: string
```
Description for each property in the object can be added like so:
```
en:
theme_metadata:
settings:
objects_setting:
description: <description> for the setting
schema:
properties:
name: <description for the name property>
links:
name: <description for the name property in link>
url: <description for the url property in link>
```
If the a description is not present, the input field will simply not
have an description.
Also note that a description for a theme setting can now be added like
so:
```
en:
theme_metadata:
settings:
some_other_setting: <This will be used as the description>
objects_setting:
description: <This will also be used as the description>
```
Continue from https://github.com/discourse/discourse/pull/25673.
This commit starts building the inputs pane of schema theme settings. At the moment only string fields are rendered, but more types will be added in future commits.
