[FEATURE] Support automated configuration of search templates

[ohltyler]

Flow Framework already supports creation of many different OpenSearch resources. Another resource that can have complex configuration is search templates. Supporting search template creation could help users automate the creation and management of them. Typically, they are related to a particular index and its field mappings; being able to create these templates alongside index creation, for examples, would close the technical gap on creating an end-to-end search flow integrated with search templates, with no external/standalone APIs to create any resources required.

Internally, I believe this would mean adding a create search template workflow step, and corresponding logic to delete, in order to fully support and integrate with workflow provisioning/deprovisioning

[dbwiddis]

So to be clear, you're asking for a template to update a template? :)