(core) - Add built-in gql tag function (#1187)
* Add built-in gql function
* Add inner document source to DocumentNodes from gql
* Update tests to use new gql helper
* Protect against invalid inputs in gql
* Fix up execute tests
* Fix linting issues in gql.ts
* Add basic tests for gql tag
* Shave some bytes off of cacheExchange
* Simplify composeExchanges helper
* Replace all usages of graphql-tag
* Update entries in docs
* Add changeset
* Revert changes / Update snapshot
* Fix linting issues in populate and core
* Add core / gql section to Queries page
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