api: rename /api/versions to versionsapi and /api/attestationcfig to attestationconfigapi (#1876)

* rename to attestationconfigapi + put client and fetcher inside pkg

* rename api/version to versionsapi and put fetcher + client inside pkg

* rename AttestationConfigAPIFetcher to Fetcher

internal/api/versionsapi/fetcher.go

@@ -0,0 +1,43 @@
+/*
+Copyright (c) Edgeless Systems GmbH
+
+SPDX-License-Identifier: AGPL-3.0-only
+*/
+
+package versionsapi
+
+import (
+	"context"
+
+	"github.com/edgelesssys/constellation/v2/internal/api/fetcher"
+)
+
+// Fetcher fetches version API resources without authentication.
+type Fetcher struct {
+	fetcher.HTTPClient
+}
+
+// NewFetcher returns a new Fetcher.
+func NewFetcher() *Fetcher {
+	return &Fetcher{fetcher.NewHTTPClient()}
+}
+
+// FetchVersionList fetches the given version list from the versions API.
+func (f *Fetcher) FetchVersionList(ctx context.Context, list List) (List, error) {
+	return fetcher.Fetch(ctx, f.HTTPClient, list)
+}
+
+// FetchVersionLatest fetches the latest version from the versions API.
+func (f *Fetcher) FetchVersionLatest(ctx context.Context, latest Latest) (Latest, error) {
+	return fetcher.Fetch(ctx, f.HTTPClient, latest)
+}
+
+// FetchImageInfo fetches the given image info from the versions API.
+func (f *Fetcher) FetchImageInfo(ctx context.Context, imageInfo ImageInfo) (ImageInfo, error) {
+	return fetcher.Fetch(ctx, f.HTTPClient, imageInfo)
+}
+
+// FetchCLIInfo fetches the given cli info from the versions API.
+func (f *Fetcher) FetchCLIInfo(ctx context.Context, cliInfo CLIInfo) (CLIInfo, error) {
+	return fetcher.Fetch(ctx, f.HTTPClient, cliInfo)
+}