doc(Dropdown): add sample code for ItemTemplate

[ArgoZhang]

add sample code for ItemTemplate

Summary of the changes (Less than 80 chars)

简单描述你更改了什么, 不超过80个字符；如果有关联 Issue 请在下方填写相关编号

Description

fixes #5373

Regression?

• Yes
• No

[If yes, specify the version the behavior has regressed from]

[是否影响老版本]

Risk

• High
• Medium
• Low

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Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Add ItemTemplate to the Dropdown component to allow customization of dropdown items. Include a sample code in the documentation to demonstrate its usage. Fix the alignment of dropdown item content within the tooltip.

New Features:

• Add ItemTemplate property to the Dropdown component to support custom item rendering

Bug Fixes:

• Fix dropdown item content alignment within the tooltip

Documentation:

• Add sample code demonstrating the usage of ItemTemplate in Dropdown component

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds a new sample to the documentation demonstrating the usage of the ItemTemplate feature of the Dropdown component. The implementation involves adding a new demo section with corresponding code and data, as well as modifying the Dropdown component to render the ItemTemplate.

Sequence diagram for rendering Dropdown with ItemTemplate

sequenceDiagram
    participant Dropdown Component
    participant ItemTemplate
    participant Tooltip Component

    Dropdown Component->>ItemTemplate: For each item
    ItemTemplate->>Tooltip Component: Render Tooltip with item data
    Tooltip Component-->>ItemTemplate: Returns rendered item
    ItemTemplate-->>Dropdown Component: Returns rendered item
    Dropdown Component->>Dropdown Component: Display item in dropdown

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Updated class diagram for the Dropdown component

classDiagram
    class Dropdown {
        +RenderFragment ItemTemplate
    }
    Dropdown : +renders items via ItemTemplate

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File-Level Changes

Change	Details	Files
Added a new sample demonstrating the usage of ItemTemplate within the Dropdown component.	Added a new DemoBlock named ItemTemplate to showcase the Dropdown component with a custom ItemTemplate. Created a List<SelectedItem> named ItemTemplateList in the code-behind file to provide data for the Dropdown in the ItemTemplate demo. Modified the Dropdown component to render the ItemTemplate for each item when it is provided. Added styling to align items within the dropdown when a tooltip is present.	src/BootstrapBlazor.Server/Components/Samples/Dropdowns.razor src/BootstrapBlazor.Server/Components/Samples/Dropdowns.razor.cs src/BootstrapBlazor/Components/Tooltip/Tooltip.razor.scss src/BootstrapBlazor/Components/Dropdown/Dropdown.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5373	Add a Tooltip attribute to the SelectedItem data structure.	❌	The PR does not modify the SelectedItem class to include a Tooltip attribute. It only adds sample code for the ItemTemplate feature of the Dropdown component, demonstrating how to use a tooltip within the template.
#5373	Support the Tooltip feature if the Tooltip attribute in SelectedItem is not null.	❌	The PR does not implement any logic to check for a Tooltip attribute on SelectedItem and display a tooltip accordingly. It focuses on demonstrating the ItemTemplate with a hardcoded tooltip.
#5373	Add sample code demonstrating the use of tooltips in dropdown items.	✅

Possibly linked issues

• feat(SelectedItem): support tooltip #5373: The PR closes the issue by adding an ItemTemplate sample code for Dropdown, addressing the unclear layout problem.
• feat(SelectedItem): support tooltip #5373: The PR fixes the issue by adding a tooltip with an icon to the dropdown item template.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a screenshot of the new Dropdown ItemTemplate example to the pull request description.
• The added CSS rule seems overly specific; consider if a more general rule would suffice.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

---

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (8a5e79c) to head (49d34fc).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5374   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          644       644           
  Lines        29220     29218    -2     
  Branches      4125      4125           
=========================================
- Hits         29220     29218    -2     

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