[meta] Support Kotlin meta generator (#4156)

* [meta] Support Kotlin meta generator

* Guard against automatic scripts (assumptions for this script are not fulfilled by some CI which run "run all" type scripts)

samples/meta-codegen-kotlin/usage/src/org/openapitools/api/PetApi.sample

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+
+# This is a sample api mustache template.  It is representing a ficticous 
+# language and won't be usable or compile to anything without lots of changes.
+# Use it as an example.  You can access the variables in the generator object
+# like such:
+
+# use the package from the `apiPackage` variable
+package: org.openapitools.api
+
+# operations block
+classname: PetApi
+
+# loop over each operation in the API:
+
+# each operation has an `operationId`:
+operationId: addPet
+
+# and parameters:
+body: Pet
+
+
+# each operation has an `operationId`:
+operationId: deletePet
+
+# and parameters:
+petId: Long
+apiKey: String
+
+
+# each operation has an `operationId`:
+operationId: findPetsByStatus
+
+# and parameters:
+status: List
+
+
+# each operation has an `operationId`:
+operationId: findPetsByTags
+
+# and parameters:
+tags: List
+
+
+# each operation has an `operationId`:
+operationId: getPetById
+
+# and parameters:
+petId: Long
+
+
+# each operation has an `operationId`:
+operationId: updatePet
+
+# and parameters:
+body: Pet
+
+
+# each operation has an `operationId`:
+operationId: updatePetWithForm
+
+# and parameters:
+petId: String
+name: String
+status: String
+
+
+# each operation has an `operationId`:
+operationId: uploadFile
+
+# and parameters:
+petId: Long
+additionalMetadata: String
+file: File
+
+
+# end of operations block

samples/meta-codegen-kotlin/usage/src/org/openapitools/api/StoreApi.sample

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+
+# This is a sample api mustache template.  It is representing a ficticous 
+# language and won't be usable or compile to anything without lots of changes.
+# Use it as an example.  You can access the variables in the generator object
+# like such:
+
+# use the package from the `apiPackage` variable
+package: org.openapitools.api
+
+# operations block
+classname: StoreApi
+
+# loop over each operation in the API:
+
+# each operation has an `operationId`:
+operationId: deleteOrder
+
+# and parameters:
+orderId: String
+
+
+# each operation has an `operationId`:
+operationId: getInventory
+
+# and parameters:
+
+
+# each operation has an `operationId`:
+operationId: getOrderById
+
+# and parameters:
+orderId: String
+
+
+# each operation has an `operationId`:
+operationId: placeOrder
+
+# and parameters:
+body: Order
+
+
+# end of operations block

samples/meta-codegen-kotlin/usage/src/org/openapitools/api/UserApi.sample

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+
+# This is a sample api mustache template.  It is representing a ficticous 
+# language and won't be usable or compile to anything without lots of changes.
+# Use it as an example.  You can access the variables in the generator object
+# like such:
+
+# use the package from the `apiPackage` variable
+package: org.openapitools.api
+
+# operations block
+classname: UserApi
+
+# loop over each operation in the API:
+
+# each operation has an `operationId`:
+operationId: createUser
+
+# and parameters:
+body: User
+
+
+# each operation has an `operationId`:
+operationId: createUsersWithArrayInput
+
+# and parameters:
+body: List
+
+
+# each operation has an `operationId`:
+operationId: createUsersWithListInput
+
+# and parameters:
+body: List
+
+
+# each operation has an `operationId`:
+operationId: deleteUser
+
+# and parameters:
+username: String
+
+
+# each operation has an `operationId`:
+operationId: getUserByName
+
+# and parameters:
+username: String
+
+
+# each operation has an `operationId`:
+operationId: loginUser
+
+# and parameters:
+username: String
+password: String
+
+
+# each operation has an `operationId`:
+operationId: logoutUser
+
+# and parameters:
+
+
+# each operation has an `operationId`:
+operationId: updateUser
+
+# and parameters:
+username: String
+body: User
+
+
+# end of operations block

samples/meta-codegen-kotlin/usage/src/org/openapitools/model/Category.sample

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+# This is a sample model mustache template.

samples/meta-codegen-kotlin/usage/src/org/openapitools/model/Order.sample

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+# This is a sample model mustache template.

samples/meta-codegen-kotlin/usage/src/org/openapitools/model/Pet.sample

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+# This is a sample model mustache template.

samples/meta-codegen-kotlin/usage/src/org/openapitools/model/Tag.sample

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+# This is a sample model mustache template.

samples/meta-codegen-kotlin/usage/src/org/openapitools/model/User.sample

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+# This is a sample model mustache template.