Adds spec additionalProperties + nullable examples (#2405)

* Adds v2 spec additionalproperties examples, adds v3 spec nulllable model example, updates samples

* Remaining samples updates

* Adds csharp generator update to handle models with multilevel parent types, which works for the AdditionalPropertiesObject model, samples updated

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesAnyType.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesAnyType
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesArray.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesArray
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesBoolean.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesBoolean
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesClass.md

@@ -4,8 +4,17 @@
 ## Properties
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
-**mapProperty** | **Map<String, String>** |  |  [optional]
-**mapOfMapProperty** | [**Map<String, Map<String, String>>**](Map.md) |  |  [optional]
+**mapString** | **Map<String, String>** |  |  [optional]
+**mapNumber** | [**Map<String, BigDecimal>**](BigDecimal.md) |  |  [optional]
+**mapInteger** | **Map<String, Integer>** |  |  [optional]
+**mapBoolean** | **Map<String, Boolean>** |  |  [optional]
+**mapArrayInteger** | [**Map<String, List<Integer>>**](List.md) |  |  [optional]
+**mapArrayAnytype** | [**Map<String, List<Object>>**](List.md) |  |  [optional]
+**mapMapString** | [**Map<String, Map<String, String>>**](Map.md) |  |  [optional]
+**mapMapAnytype** | [**Map<String, Map<String, Object>>**](Map.md) |  |  [optional]
+**anytype1** | [**Object**](.md) |  |  [optional]
+**anytype2** | [**Object**](.md) |  |  [optional]
+**anytype3** | [**Object**](.md) |  |  [optional]
 
 
 

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesInteger.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesInteger
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesNumber.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesNumber
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesObject.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesObject
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+

samples/client/petstore/java/google-api-client/docs/AdditionalPropertiesString.md

@@ -0,0 +1,10 @@
+
+# AdditionalPropertiesString
+
+## Properties
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**name** | **String** |  |  [optional]
+
+
+