Keeping the function to read plugin resource generic for any type of resource. Now the parent function can also conditionally decide which plugin would require to read which resources from the filesystem.
Co-authored-by: Arpit Mohan <arpit@appsmith.com>
Add server-side templates support for plugins
Two main themes in this MR:
1. Add support for saving query templates as resource files inside a plugin. This has been done for both Postgres and MongoDB plugins, based on current template contents.
2. Loading of form JSON is now reactive. The blocking call has been moved inside a `Mono.fromSupplier`.
3. The loading of from JSON as well as the templates is cached and are loaded on-demand. This means that the templates are loaded once for a plugin through the lifetime of the server process, and that they are loaded only at the first time they are needed.
4. If loading of these resources fails, we try again when they are needed the next time.
See merge request theappsmith/internal-tools-server!385
This is to simplify the query pane on the frontend client. The client doesn't need to have separate interfaces for sql and non-sql plugins. All queries will be sent to the server in the form of a String that is parsed in different formats based on the plugin.
Also adding test cases for PostgresPlugin. Used TestContainers to simulate the postgres db in Docker inside the Java test itself. Very useful.
