Update base for Update on "[Executorch] Make module constructors uniform across"

Existing constructors dont compose well such that if you want data loader or data files constructor then you cannot get to override memory allocator.
Fix that.

Differential Revision: [D86120037](https://our.internmc.facebook.com/intern/diff/D86120037/)

[ghstack-poisoned]

Author: kimishpatel

extension/memory_allocator/test/cpu_caching_malloc_allocator_test.cpp

@@ -330,12 +330,8 @@ TEST_F(CPUCachingAllocatorTest, ResetFreesEverythingWhenOverMaxSize) {
   EXPECT_NE(p5, nullptr);
 
   // These should be new allocations, not cached ones
-  EXPECT_NE(p4, p1);
-  EXPECT_NE(p4, p2);
-  EXPECT_NE(p4, p3);
-  EXPECT_NE(p5, p1);
-  EXPECT_NE(p5, p2);
-  EXPECT_NE(p5, p3);
+  // However, system allocator might cache and return the same pointesr
+  // so we can't check for strict equality or inequality
 }
 
 TEST_F(CPUCachingAllocatorTest, ResetCachesWhenUnderMaxSize) {