Add Visual Studio snippets extension for static imports and component patterns

[Copilot]

BlazorWebFormsComponents uses static classes for enumeration types, requiring verbose fully-qualified names in markup. This adds a VSIX extension to provide code snippets for static imports and common component patterns.

Changes

New Project: BlazorWebFormsComponents.Snippets

• VSIX extension targeting VS 2022 (17.0+)
• Contains 13 snippets with .pkgdef registration for Razor/C#/HTML contexts

Static Import Snippets

Enable concise enumeration usage:

• bwfall - All common enum static imports
• bwfrepeat - RepeatLayout
• bwfdatalist - DataListEnum
• bwfvalidation - Validation enums

Component Pattern Snippets

Templates with tab-navigable placeholders:

• Data controls: bwfgridview, bwfdl, bwfrepeater, bwfformview
• Form controls: bwfbutton, bwftextbox, bwfcheckboxlist
• Validation: bwfrequired, bwfvalsummary

All snippets use correct generic parameter names (ItemType for most components, TItem for CheckBoxList).

Documentation

• docs/UtilityFeatures/Snippets.md - Usage guide and snippet reference
• Updated mkdocs.yml and README.md with snippets section

Example

Before (verbose):

<DataList RepeatLayout="BlazorWebFormsComponents.Enums.RepeatLayout.Table" 
          RepeatDirection="BlazorWebFormsComponents.Enums.DataListEnum.Horizontal">

After (with bwfall snippet + static imports):

@using static BlazorWebFormsComponents.Enums.RepeatLayout
@using static BlazorWebFormsComponents.Enums.DataListEnum

<DataList RepeatLayout="Table" RepeatDirection="Horizontal">

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Create a Snippet package</issue_title>
<issue_description>Suggestion to publish a Snippet package for the static imports to anabe phau enumeration types as well as other useful markup snippets.

Another option may be an extension or project templates</issue_description>

Comments on the Issue (you are @copilot in this section)

@csharpfritz Coming back to this and getting some Copilot assistance. This is a good idea

• Fixes Create a Snippet package #11

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