feat: Add Document Deletion with a Key (#150)

This enables the deletion of a single document using their dockey.

The query will look like something like this:

mutation {
    delete_user(id: "bae-6a6482a8-24e1-5c73-a237-ca569e41507d") {
        deletedDocKey: _key
    }
}
Note: deletedDocKey is an alias of a deleted key.

This PR resolves and closes #32 and #163

Future Work:

Implement the deletion of multiple documents using multiple keys.
Implement the deletion of documents using filters.

Makefile

@@ -20,6 +20,10 @@ multi-build:
 start: build
 	./build/defradb start
 
+.PHONY: dump
+dump: build
+	./build/defradb client dump
+
 .PHONY: deps\:golangci-lint
 deps\:golangci-lint:
 	curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b ${GOPATH}/bin v1.43.0
@@ -32,19 +36,26 @@ deps\:go-acc:
 deps: deps\:golangci-lint deps\:go-acc
 	go mod download
 
+.PHONY: tidy
+tidy:
+	go mod tidy
+
 .PHONY: clean
 clean:
 	go clean cli/defradb/main.go
 	rm -f build/defradb
 
-.PHONY: tidy
-tidy:
-	go mod tidy
+.PHONY: clean\:test
+clean\:test:
+	go clean -testcache
 
 .PHONY: test
 test:
 	go test ./... -race
 
+.PHONY: test\:clean
+test\:clean: clean\:test test
+
 .PHONY: test\:bench
 test\:bench:
 	go test ./... -race -bench=.

client/core.go

@@ -68,19 +68,30 @@ type Collection interface {
 	UpdateWithKey(context.Context, key.DocKey, interface{}, ...UpdateOpt) (*UpdateResult, error)
 	UpdateWithKeys(context.Context, []key.DocKey, interface{}, ...UpdateOpt) (*UpdateResult, error)
 
+	DeleteWith(context.Context, interface{}, ...DeleteOpt) error
+	DeleteWithFilter(context.Context, interface{}, ...DeleteOpt) (*DeleteResult, error)
+	DeleteWithKey(context.Context, key.DocKey, ...DeleteOpt) (*DeleteResult, error)
+	DeleteWithKeys(context.Context, []key.DocKey, ...DeleteOpt) (*DeleteResult, error)
+
 	Get(context.Context, key.DocKey) (*document.Document, error)
 
 	WithTxn(Txn) Collection
 }
 
 type UpdateOpt struct{}
 type CreateOpt struct{}
+type DeleteOpt struct{}
 
 type UpdateResult struct {
 	Count   int64
 	DocKeys []string
 }
 
+type DeleteResult struct {
+	Count   int64
+	DocKeys []string
+}
+
 type QueryResult struct {
 	Errors []interface{} `json:"errors,omitempty"`
 	Data   interface{}   `json:"data"`