fix: allow different shops to have same tag name

[MohanNarayana]

Signed-off-by: Mohan Narayana [email protected]

Resolves #28
Impact: minor
Type: bugfix

Issue

The problem is that Tag's slug is unique across the whole system. For system where there can be multiple shops it doesn't look like a good solution since it's a very common case to have same tags in different shops

Solution

Make slug and shopId index pair value to be unique.

Testing

1. Set up api-migrations using these steps. NOTE: Use node 14 at step 3. Copy the new api-plugin-tags to api-migrations/node_modules/@reactioncommerce.
2. Add below code to api-migrations/migrator.config.js
   { namespace: "tags", package: "@reactioncommerce/api-plugin-tags", version: 2 }
3. Run MONGO_URL=mongodb://localhost:27017/reaction npx migrator migrate
4. Check DB for index 'slug_1' in the tags table.

[rc-publisher]

🎉 This PR is included in version 1.1.5 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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