feat(SelectTable): add EmptyTemplate parameter

[ArgoZhang]

add EmptyTemplate parameter

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 #5212

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 an EmptyTemplate parameter to the SelectTable component to allow custom content to be displayed when no data is available.

New Features:

• Added an EmptyTemplate parameter to the SelectTable component. This parameter allows developers to customize the content displayed when the table is empty.

Tests:

• Added unit tests for the EmptyTemplate functionality.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request introduces the EmptyTemplate parameter to the SelectTable component, allowing users to display a custom template when no data is available.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Added EmptyTemplate and ShowEmpty parameters to the SelectTable component.	Added the ShowEmpty parameter to control the visibility of the empty template. Added the EmptyTemplate parameter to allow users to define a custom template when no data is available. Passed the ShowEmpty and EmptyTemplate parameters to the underlying Table component.	src/BootstrapBlazor/Components/Select/SelectTable.razor.cs src/BootstrapBlazor/Components/Select/SelectTable.razor
Added a unit test for the EmptyTemplate functionality.	Created a new test case EmptyTemplate_OK to verify the correct rendering of the empty template. The test case sets up a SelectTable with an empty data source and a custom EmptyTemplate. The test case asserts that the rendered output contains the custom empty template.	test/UnitTest/Components/SelectTableTest.cs

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#5212	Add EmptyTemplate support to SelectTable component similar to Table component	✅
#5212	Implement ShowEmpty parameter to control empty state visibility	✅

Possibly linked issues

• feat(SelectTable): support EmptyTemplate like Table does. #5212: The PR adds the EmptyTemplate parameter to support EmptyTemplate, which is exactly what the issue requests.

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟡 Testing: 1 issue found
• 🟢 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 (895170d) to head (fe987c9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #5217   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          634       634           
  Lines        28227     28229    +2     
  Branches      4063      4063           
=========================================
+ Hits         28227     28229    +2     

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