[functions] Create function form The parameters should be categorized into groups.

* [ ] The parameters should be categorized into groups
* required fields
* function (language, codeFile, class)
* resources
* input
* output
* [ ] language select should a droplist
* [ ] input and output topics should be able to select from other tenant and namespaces
* [ ] Edit and Delete buttons should be per function
* [ ] Function should have a details page to show the list of instances.
* [ ] Each instance should have a link to the function worker or broker that runs this function.