fix(medusa-js): missing devDependency was failing repo build task (#2804)

### What

Explicitly declare `@medusajs/medusa` as a devDependency for `@medusajs/medusa-js` client package.

### Why

With our latest version upgrade of `turbo`, peerDependencies aren't taken into account in the build graph. The recommendation is to also explicitly declare them in devDependencies.

### Test

* Run `yarn build --graph`
* Expect to see medusa-js having a dependency on medusa
```
"[root] @medusajs/medusa-js#build" -> "[root] @medusajs/medusa#build"
```

.changeset/giant-insects-tease.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/medusa-js": patch
+---
+
+fix: missing devDependency was failing repo build task

packages/medusa-js/package.json

@@ -32,6 +32,7 @@
     "url": "https://github.com/medusajs/medusa/issues"
   },
   "devDependencies": {
+    "@medusajs/medusa": "^1.7.0",
     "@types/jest": "^26.0.19",
     "cross-env": "^7.0.3",
     "jest": "^26.6.3",

yarn.lock

@@ -4381,6 +4381,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "@medusajs/medusa-js@workspace:packages/medusa-js"
   dependencies:
+    "@medusajs/medusa": ^1.7.0
     "@types/jest": ^26.0.19
     axios: ^0.24.0
     cross-env: ^7.0.3
@@ -4394,7 +4395,7 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@medusajs/medusa@*, @medusajs/medusa@^1.3.3, @medusajs/medusa@workspace:packages/medusa":
+"@medusajs/medusa@*, @medusajs/medusa@^1.3.3, @medusajs/medusa@^1.7.0, @medusajs/medusa@workspace:packages/medusa":
   version: 0.0.0-use.local
   resolution: "@medusajs/medusa@workspace:packages/medusa"
   dependencies: