Admin UI: big cleanup of query construction

[Vultraz]

And now, my big weekend PR.

This refactors the Admin UI's list and item query construction. Instead of using complicated and very hard-to-read string concatenation, this makes use of query variables wherever possible.

• All queries are now named (prep for another change I have coming)!
• Changes the item query to a single, static query (since we're always fetching all fields) taking an id argument.
• List queries now use variables for all input (search, where, skip, first, and sortBy). The new getListQuery function only takes fields to control which fields we're querying since that can't be done via variables. Even better, using variables makes it clear exactly what arguments are accepted and their types.
• Since where filters are just passed in via variables now, getFilterGraphQL doesn't need to handle messy strings anymore and can just return plain objects!
• gqlCountQueries was removed and replaced with a helper in Home/index.js.

[changeset-bot]

🦋 Changeset is good to go

Latest commit: b45573b

We got this.

This PR includes changesets to release 29 packages

Name	Type
@keystonejs/app-admin-ui	Major
@keystonejs/field-content	Major
@keystonejs/fields	Major
@keystonejs/fields-mongoid	Major
@keystonejs/demo-project-blog	Patch
@keystonejs/demo-custom-fields	Patch
@keystonejs/demo-project-meetup	Patch
@keystonejs/demo-project-todo	Patch
@keystonejs/cypress-project-access-control	Patch
@keystonejs/cypress-project-basic	Patch
@keystonejs/cypress-project-client-validation	Patch
@keystonejs/cypress-project-login	Patch
@keystonejs/cypress-project-social-login	Patch
@keystonejs/example-projects-blank	Patch
@keystonejs/example-projects-nuxt	Patch
@keystonejs/example-projects-starter	Patch
@keystonejs/example-projects-todo	Patch
@keystonejs/auth-passport	Patch
@keystonejs/auth-password	Patch
@keystonejs/fields-authed-relationship	Patch
@keystonejs/fields-auto-increment	Patch
@keystonejs/fields-datetime-utc	Patch
@keystonejs/fields-markdown	Patch
@keystonejs/fields-wysiwyg-tinymce	Patch
@keystonejs/keystone	Patch
@keystonejs/list-plugins	Patch
@keystonejs/api-tests	Patch
@keystonejs/benchmarks	Patch
@keystonejs/adapter-mongoose	Patch

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[timleslie]

This all looks fantastic. The one change to make is that this is actually a major version bump on each package, since the API of getFilterGraphQL has changed from returning a string to an object, which is a breaking change.

[Vultraz]

@timleslie done 👍

[timleslie]

Yep, looks good 👍