MM-17912: Allow searching for files through plugin API (#13647)

* constants and options for getting files

* Method to get files with options

* Add i18n strings for en

* Add API methods for getting files with options

* gofmt -s file

* explicitly set create at in tests

* use greater than nanosecond time difference for tests

* use gte instead of gt for getting files by created time

* use created at time as default sort order for getting file infos

* use explicit inline strings instead of format strings

* join tables only when required

* use if as secondary sort, and update tests

* update field docs to reflect previous changes

* make page and perPage get options as required

* add json struct tags to GetFileOptions

* bump minimum server versioni

* remove sorting by username and channelname

* use bool for sort order type

* use FileInfo prefix instead of just File

* clearer comments

* use zero-based page numbering

* test filtering by user and channel

* remove unnecessary whitespace

* use int instead of uint for page and perPage arguments

Co-authored-by: mattermod <mattermod@users.noreply.github.com>

i18n/en.json

@@ -6270,6 +6270,10 @@
     "id": "store.sql_file_info.get_for_user_id.app_error",
     "translation": "Unable to get the file info for the user"
   },
+  {
+    "id": "store.sql_file_info.get_with_options.app_error",
+    "translation": "Unable to get the file info with options"
+  },
   {
     "id": "store.sql_file_info.permanent_delete.app_error",
     "translation": "Unable to permanently delete the file info"