Implement template CRUD api

models/template_db.go

restapi/configure_rednerd.go

restapi/embedded_spec.go

restapi/handlers/account-template-delete.go

restapi/handlers/account-template-get.go

restapi/handlers/account-template-list.go

restapi/handlers/account-template-update.go

restapi/operations/logging.go

restapi/operations/prometheus.go

restapi/operations/rednerd_api.go

...operations/template_management/account_template_delete.go

...template_management/account_template_delete_parameters.go

...template_management/account_template_delete_prometheus.go

.../template_management/account_template_delete_responses.go

...template_management/account_template_delete_urlbuilder.go

...pi/operations/template_management/account_template_get.go

...ns/template_management/account_template_get_parameters.go

...ns/template_management/account_template_get_prometheus.go

...ons/template_management/account_template_get_responses.go

...ns/template_management/account_template_get_urlbuilder.go