feat(medusa): Products can be added to categories in batch request (#3123)

* wip

* chore: fix issues with join table

* chore: fix issues

* chore: fix ordering issue on random failing test

* chore: revert table name

* chore: added oas for category

* chore: update categories for a product

* chore: add remove category test

* chore: added changeset

* chore: address review comments

* chore: Products can be added to categories in batch request

* chore: address review comments + add unit specs

* chore: make template optional

.changeset/tidy-students-kiss.md

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+---
+"@medusajs/medusa": patch
+---
+
+feat(medusa): Products can be added to categories in batch request