feat(fortuna): refactor explorer endpoint & history query methods

This commit implements a few fixes for the fortuna explorer endpoint, and in
doing so I refactored the query methods.  We are now using a query builder
approach which enables the filters, limits, offsets, etc to all work correctly
regardless of the query supplied.

This commit also implements a new query param to filter on state.

Author: cprussin

apps/fortuna/.gitignore

@@ -2,3 +2,5 @@
 *config.yaml
 *secret*
 *private-key*
+.envrc
+fortuna.db