docs: updates to use DML and other changes (#7834)

- Change existing data model guides and add new ones for DML
- Change module's docs around service factory + remove guides that are now necessary
- Hide/remove all mentions of module relationships, or label them as coming soon.
- Change all data model creation snippets to use DML
- use `property` instead of `field` when referring to a data model's properties.
- Fix all snippets in commerce module guides to use new method suffix (no more main model methods)
- Rework recipes, removing/hiding a lot of sections as a lot of recipes are incomplete with the current state of DML.


### Other changes

- Highlight fixes in some guides
- Remove feature flags guide
- Fix code block styles when there are no line numbers.

### Upcoming changes in other PRs

- Re-generate commerce module references (for the updates in the method names)
- Ensure that the data model references are generated correctly for models using DML.
- (probably at a very later point) revisit recipes

www/apps/resources/app/commerce-modules/currency/examples/page.mdx

@@ -26,7 +26,7 @@ In this guide, you’ll find common examples of how you can use the Currency Mod
       req.scope.resolve(ModuleRegistrationName.CURRENCY)
 
     res.json({
-      currencies: await currencyModuleService.list(),
+      currencies: await currencyModuleService.listCurrencies(),
     })
   }
   ```
@@ -42,10 +42,11 @@ In this guide, you’ll find common examples of how you can use the Currency Mod
   } from "@medusajs/currency"
 
   export async function GET(request: Request) {
-    const currencyModuleService = await initializeCurrencyModule()
+    const currencyModuleService = 
+      await initializeCurrencyModule()
 
     return NextResponse.json({
-      currencies: await currencyModuleService.list(),
+      currencies: await currencyModuleService.listCurrencies(),
     })
   }
   ```
@@ -72,7 +73,8 @@ In this guide, you’ll find common examples of how you can use the Currency Mod
     const currencyModuleService: ICurrencyModuleService =
       req.scope.resolve(ModuleRegistrationName.CURRENCY)
 
-    const currency = await currencyModuleService.retrieve("usd")
+    const currency = await currencyModuleService
+      .retrieveCurrency("usd")
 
     res.json({
       currency,
@@ -95,7 +97,8 @@ In this guide, you’ll find common examples of how you can use the Currency Mod
   ) {
     const currencyModuleService = await initializeCurrencyModule()
 
-    const currency = await currencyModuleService.retrieve("usd")
+    const currency = await currencyModuleService
+      .retrieveCurrency("usd")
 
     return NextResponse.json({ currency })
   }