[breaking] Remove indexes v2 endpoint (#838)

* remove indexes endpoint, since it's not used

run `goa gen github.com/arduino/arduino-create-agent/design`

* remove v2 index logic

* removed useless API level code

* factor out index handling of the index to a separate package
the `.arduino-create` dir is now created by the `index.Init()` func

* make the IndexReasource a pointer so that it can be shared

* pass the shared Index structure to the goa Server

* allow the tools endpoint to install and list available tools from default package_index.json only
and fix/adapt tests

* add test

* rename to Resource

* `go mod tidy`

* factor out index download logic

Co-authored-by: Alessio Perugini <alessioper.98@gmail.com>

* always download the index the first time

Co-authored-by: Alessio Perugini <alessioper.98@gmail.com>

* make pkgs.Tools struct properties unexported and use "constructor"

* make tools.Tools struct properties unexported and use a "constructor"

* increment delay for the test startup

---------

Co-authored-by: Alessio Perugini <alessioper.98@gmail.com>

Author: umbynos

.licenses/arduino-create-agent/go/go.bug.st/downloader/v2.dep.yml

@@ -17,41 +17,6 @@ package design
 
 import . "goa.design/goa/v3/dsl"
 
-var _ = Service("indexes", func() {
-	Description("The indexes service manages the package_index files")
-
-	Error("invalid_url", ErrorResult, "url invalid")
-	HTTP(func() {
-		Response("invalid_url", StatusBadRequest)
-	})
-
-	Method("list", func() {
-		Result(ArrayOf(String))
-		HTTP(func() {
-			GET("/pkgs/indexes")
-			Response(StatusOK)
-		})
-	})
-
-	Method("add", func() {
-		Payload(IndexPayload)
-		Result(Operation)
-		HTTP(func() {
-			POST("/pkgs/indexes/add")
-			Response(StatusOK)
-		})
-	})
-
-	Method("remove", func() {
-		Payload(IndexPayload)
-		Result(Operation)
-		HTTP(func() {
-			POST("/pkgs/indexes/delete")
-			Response(StatusOK)
-		})
-	})
-})
-
 var _ = Service("tools", func() {
 	Description("The tools service manages the available and installed tools")
 
@@ -95,15 +60,6 @@ var _ = Service("tools", func() {
 	})
 })
 
-var IndexPayload = Type("arduino.index", func() {
-	TypeName("IndexPayload")
-
-	Attribute("url", String, "The url of the index file", func() {
-		Example("https://downloads.arduino.cc/packages/package_index.json")
-	})
-	Required("url")
-})
-
 var ToolPayload = Type("arduino.tool", func() {
 	Description(`A tool is an executable program that can upload sketches. 
 	If url is absent the tool will be searched among the package index installed`)