Descriptions for errors from Static code generator

Previously, all Bad request error messages weren't accompanied by any specific description.

Recently, we added descriptions for your convenience.

Here are the examples:

Get static store home page:

//If a required parameter is missing
CODE:400
MESSAGE:Missed responseType parameter. Expected request path is /storeId/responseType

//If a store ID format is invalid
CODE:400
MESSAGE:Invalid storeId parameter: number expected 

//If a response type is invalid 
CODE:400
MESSAGE:Invalid response type. It should be 'static-code'

Get static product page

//If a required parameter is missing
CODE:400
MESSAGE:Missed responseType parameter. Expected request path is /storeId/productId/responseType 

//If product ID format is invalid 
CODE:400
MESSAGE:Invalid entityId parameter: number expected 

//If a response type is invalid 
CODE:400
MESSAGE:Invalid response type. It should be 'static-code'

Get static category page

//If a required parameter is missing
CODE:400
MESSAGE:Missed responseType parameter. Expected request path is /storeId/categoryId/responseType 

//If a category ID format is invalid 
CODE:400
MESSAGE:Invalid entityId parameter: number expected 

//If a response type is invalid 
CODE:400
MESSAGE:Invalid response type. It should be 'static-code'