Refactor billing service and enhance account APIs

This commit includes renaming and refactoring of some billing services for clarification and coherence. It also improves account APIs in team-accounts and accounts packages by having added `getAccount` and `getTeamAccount` methods, allowing retrieval of account details via slug and id. Changes also include type modifications in `getSupabaseServerActionClient` function for better flexibility and precision.

packages/features/accounts/src/server/api.ts

@@ -10,6 +10,25 @@ import { Database } from '@kit/supabase/database';
 class AccountsApi {
   constructor(private readonly client: SupabaseClient<Database>) {}
 
+  /**
+   * @name getAccount
+   * @description Get the account data for the given ID.
+   * @param id
+   */
+  async getAccount(id: string) {
+    const { data, error } = await this.client
+      .from('accounts')
+      .select('*')
+      .eq('id', id)
+      .single();
+
+    if (error) {
+      throw error;
+    }
+
+    return data;
+  }
+
   /**
    * @name getAccountWorkspace
    * @description Get the account workspace data.