adds support for workspace presets to the coderd database. Support in the API and web frontend will be added in subsequent pull requests. This is the smallest meaningful contribution that I could get passing tests for.

* Add workspace preset tables to the database in a migration
* Add queries to manipulate workspace presets to the database
* Generate db related code for the newly added queries
* Implement new methods to satisfy the Querier interface in dbauthz, dbmem, dbmock and querymetrics
* Implement the required tests for dbauthz
* Update the audit table to track changes to the new column in workspace builds

coderd/database/queries/presets.sql

@@ -0,0 +1,44 @@
+-- name: InsertPreset :one
+INSERT INTO
+	template_version_presets (template_version_id, name, created_at, updated_at)
+VALUES
+	(@template_version_id, @name, @created_at, @updated_at) RETURNING *;
+
+-- InsertPresetParameter :one
+INSERT INTO
+	template_version_preset_parameters (template_version_preset_id, name, value)
+VALUES
+	(@template_version_preset_id, @name, @value) RETURNING *;
+
+-- name: GetPresetsByTemplateVersionID :many
+SELECT
+	id,
+	name,
+	created_at,
+	updated_at
+FROM
+	template_version_presets
+WHERE
+	template_version_id = @template_version_id;
+
+-- name: GetPresetByWorkspaceBuildID :one
+SELECT
+	template_version_presets.id,
+	template_version_presets.name,
+	template_version_presets.created_at,
+	template_version_presets.updated_at
+FROM
+	workspace_builds
+	LEFT JOIN template_version_presets ON workspace_builds.template_version_preset_id = template_version_presets.id
+WHERE
+	workspace_builds.id = @workspace_build_id;
+
+-- name: GetPresetParametersByPresetID :many
+SELECT
+	id,
+	name,
+	value
+FROM
+	template_version_preset_parameters
+WHERE
+	template_version_preset_id = @template_version_preset_id;