Move the API struct definitions into internal/weldr

This will prevent problems with import loops. client already imports
weldr, so weldr cannot import client.

internal/weldr/json.go

@@ -0,0 +1,77 @@
+// Package weldr - json contains Exported API request/response structures
+// Copyright (C) 2020 by Red Hat, Inc.
+package weldr
+
+import (
+	"github.com/osbuild/osbuild-composer/internal/blueprint"
+	"github.com/osbuild/osbuild-composer/internal/rpmmd"
+)
+
+// StatusV0 is the response to /api/status from a v0+ server
+type StatusV0 struct {
+	API           string   `json:"api"`
+	DBSupported   bool     `json:"db_supported"`
+	DBVersion     string   `json:"db_version"`
+	SchemaVersion string   `json:"schema_version"`
+	Backend       string   `json:"backend"`
+	Build         string   `json:"build"`
+	Messages      []string `json:"messages"`
+}
+
+// BlueprintsListV0 is the response to /blueprints/list request
+type BlueprintsListV0 struct {
+	Total      uint     `json:"total"`
+	Offset     uint     `json:"offset"`
+	Limit      uint     `json:"limit"`
+	Blueprints []string `json:"blueprints"`
+}
+
+// ResponseError holds the API response error details
+type ResponseError struct {
+	Code int    `json:"code,omitempty"`
+	ID   string `json:"id"`
+	Msg  string `json:"msg"`
+}
+
+// BlueprintsInfoV0 is the response to /blueprints/info?format=json request
+type BlueprintsInfoV0 struct {
+	Blueprints []blueprint.Blueprint `json:"blueprints"`
+	Changes    []infoChange          `json:"changes"`
+	Errors     []ResponseError       `json:"errors"`
+}
+type infoChange struct {
+	Changed bool   `json:"changed"`
+	Name    string `json:"name"`
+}
+
+// BlueprintsChangesV0 is the response to /blueprints/changes/ request
+type BlueprintsChangesV0 struct {
+	BlueprintsChanges []bpChange      `json:"blueprints"`
+	Errors            []ResponseError `json:"errors"`
+	Limit             uint            `json:"limit"`
+	Offset            uint            `json:"offset"`
+}
+type bpChange struct {
+	Changes []blueprint.Change `json:"changes"`
+	Name    string             `json:"name"`
+	Total   int                `json:"total"`
+}
+
+// BlueprintsDepsolveV0 is the response to /blueprints/depsolve/ request
+type BlueprintsDepsolveV0 struct {
+	Blueprints []depsolveEntry `json:"blueprints"`
+	Errors     []ResponseError `json:"errors"`
+}
+type depsolveEntry struct {
+	Blueprint    blueprint.Blueprint `json:"blueprint"`
+	Dependencies []rpmmd.PackageSpec `json:"dependencies"`
+}
+
+// BlueprintsFreezeV0 is the response to /blueprints/freeze/ request
+type BlueprintsFreezeV0 struct {
+	Blueprints []blueprintFrozen `json:"blueprints"`
+	Errors     []ResponseError   `json:"errors"`
+}
+type blueprintFrozen struct {
+	Blueprint blueprint.Blueprint `json:"blueprint"`
+}