fix: InvalidOperationException from RecipeService.Search()

Context: #1726
Context: #1728

Build and run `Chefs.csproj` for e.g. net10.0-desktop and NativeAOT
while using Uno 6.6.0-dev.3:

	sed -i '' 's/"Uno.Sdk": ".*"/"Uno.Sdk": "6.6.0-dev.3"/g' global.json
	git clean -xdf Chefs{,.Api}
	dotnet publish -c Release -r osx-x64 -f net10.0-desktop -p:TargetFrameworkOverride=net10.0-desktop \
	  -bl Chefs/Chefs.csproj -p:UseSkiaRendering=true -p:SkiaPublishAot=true \
	  -p:SkiaPublishAot=true \
	  -p:IlcGenerateMapFile=true -p:IlcGenerateMstatFile=true -p:IlcGenerateDgmlFile=true -p:IlcGenerateMetadataLog=true \
	  -p:EmitCompilerGeneratedFiles=true -p:CompilerGeneratedFilesOutputPath=`pwd`/_gen
	Chefs/bin/Release/net10.0-desktop/osx-x64/publish/Chefs

From the launch screen:

 1. Click **Skip**
 2. Click ** Sign in with Apple**
 3. Click **🔍Search** on the left
 4. In the Search box, type `m`

When doing this with e838af9, the search results screen shows:

> An error occurred.

![Search Results > An error occurred][0]

…which isn't particularly helpful.

If you do all this with #1728 applied, the Console log shows:

	fail: Chefs.Business.Services.Recipes.RecipeService[0]
	      Failed to search recipes with term m
	      System.InvalidOperationException: Reflection-based serialization has been disabled for this application. Use the IServiceCollection.AddJsonTypeInfo() or IHostBuilder.UseSerialization(IHostBuilder, IEnumerable<IJsonTypeInfoResolver>, Action<IServiceCollection>) extension methods to enable JSON deserialization for type `System.Collections.Generic.Dictionary`2[[System.String, System.Private.CoreLib, Version=10.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[Chefs.Business.Models.SearchHistory, Chefs, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]`.
	         at Uno.Extensions.Serialization.SystemTextJsonSerializer.FromStream(Stream, Type) + 0x88
	         at Uno.Extensions.Serialization.SerializerExtensions.FromStream[T](ISerializer, Stream) + 0x34
	         at Uno.Extensions.Configuration.WritableOptions`1.<UpdateAsync>d__10.MoveNext() + 0x292
	      --- End of stack trace from previous location ---
	         at Chefs.Business.Services.Recipes.RecipeService.<SaveSearchHistory>d__51.MoveNext() + 0x5d
	      --- End of stack trace from previous location ---
	         at Chefs.Business.Services.Recipes.RecipeService.<SearchCore>d__24.MoveNext() + 0x8a
	      --- End of stack trace from previous location ---
	         at Chefs.Business.Services.Recipes.RecipeService.<Search>d__23.MoveNext() + 0x175

which shows what the problem is: `RecipeService.Search()` tries to
save the search history, but JSON serialization does not support
`Dictionary<string, SearchHistory>`, so an `InvalidOperationException`
is thrown.

(Unfortunately the exception is basically swallowed; PR #1728 adds
logging to that code path, and was needed to diagnose this issue.)

Update `MockEndpointContext` to emit JSON serialization metadata
for `Dictionary<string, SearchHistory>`, so that Search now works.

[0]: https://private-user-images.githubusercontent.com/155958/541004949-2be43b36-4eb1-42b1-b91d-e53a5e5545de.png?jwt=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJpc3MiOiJnaXRodWIuY29tIiwiYXVkIjoicmF3LmdpdGh1YnVzZXJjb250ZW50LmNvbSIsImtleSI6ImtleTUiLCJleHAiOjE3Njk1NDE0NjMsIm5iZiI6MTc2OTU0MTE2MywicGF0aCI6Ii8xNTU5NTgvNTQxMDA0OTQ5LTJiZTQzYjM2LTRlYjEtNDJiMS1iOTFkLWU1M2E1ZTU1NDVkZS5wbmc_WC1BbXotQWxnb3JpdGhtPUFXUzQtSE1BQy1TSEEyNTYmWC1BbXotQ3JlZGVudGlhbD1BS0lBVkNPRFlMU0E1M1BRSzRaQSUyRjIwMjYwMTI3JTJGdXMtZWFzdC0xJTJGczMlMkZhd3M0X3JlcXVlc3QmWC1BbXotRGF0ZT0yMDI2MDEyN1QxOTEyNDNaJlgtQW16LUV4cGlyZXM9MzAwJlgtQW16LVNpZ25hdHVyZT0yZDlkNzA5OTM0NzI2NWMxMjg4Njc0MTVmNWMyNjkzYTQzY2MzYWIxYTAzNGRlZjE5NjlmN2FjNzRkOGIxYjJiJlgtQW16LVNpZ25lZEhlYWRlcnM9aG9zdCJ9.a2gF7zICQIBUqWB-qdZv58UDg_DIwzKWAD8pNKJtu_g

Author: jonpryor

Chefs/App.xaml.host.cs

@@ -108,6 +108,7 @@ private void ConfigureSerialization(HostBuilderContext context, IServiceCollecti
 	{
 #if USE_MOCKS
 		services
+			.AddJsonTypeInfo(MockEndpointContext.Default.DictionaryStringSearchHistory)
 			.AddJsonTypeInfo(MockEndpointContext.Default.ListCookbookData)
 			.AddJsonTypeInfo(MockEndpointContext.Default.CookbookData)
 			.AddJsonTypeInfo(MockEndpointContext.Default.RecipeData)

Chefs/Business/Services/Serialization/MockEndpointContext.cs

@@ -3,6 +3,7 @@
 
 namespace Chefs.Data;
 
+[JsonSerializable(typeof(Dictionary<string, SearchHistory>))]
 [JsonSerializable(typeof(List<CookbookData>))]
 [JsonSerializable(typeof(CookbookData))]
 [JsonSerializable(typeof(RecipeData))]