feat: add end-to-end tests (#179)

* feat(e2e): test for version

Setup the end-to-end test machinery and add a simple test for the version command

* feat(e2e): index commands

* feat(e2e): settings tests

* feat(e2e): objects commands

* feat(e2e): synonyms commands

* feat(e2e): rules commands

* fixuxp synoynms

* feat(e2e): search commands

* chore: go mod tidy

* chore: update e2e README

* fix(e2e): replace hard-coded index name

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