feat(medusa,types): added store apis for products (#7144)

what:

- adds products list api
- adds products retrieve api

RESOLVES CORE-2016

packages/types/src/pricing/common/index.ts

@@ -4,4 +4,5 @@ export * from "./price-list"
 export * from "./price-rule"
 export * from "./price-set"
 export * from "./price-set-rule-type"
+export * from "./pricing-context"
 export * from "./rule-type"

packages/types/src/pricing/common/pricing-context.ts

@@ -0,0 +1,6 @@
+export type MedusaPricingContext = {
+  region_id?: string
+  currency_code?: string
+  customer_id?: string
+  customer_group_id?: string[]
+}