fix complex filtering expressions involving variables or field names that require escaping#111

hallettj merged 17 commits intomainhasura/ndc-mongodb:mainfrom

jessehallett/eng-1020-nested-expressions-do-not-work-if-they-require-switch-tohasura/ndc-mongodb:jessehallett/eng-1020-nested-expressions-do-not-work-if-they-require-switch-toCopy head branch name to clipboard