fix: Increase Snap interface context size limit slightly (#3246)

Increase `MAX_CONTEXT_SIZE` to 5 MB, letting Snap developers store
somewhat large objects in the interface context. This is useful for
caching images for rendering for instance.

Author: FrederikBolding

packages/snaps-controllers/src/interface/SnapInterfaceController.test.tsx

@@ -354,9 +354,9 @@ describe('SnapInterfaceController', () => {
           'SnapInterfaceController:createInterface',
           MOCK_SNAP_ID,
           element,
-          { foo: 'a'.repeat(1_000_000) },
+          { foo: 'a'.repeat(5_000_000) },
         ),
-      ).rejects.toThrow('A Snap interface context may not be larger than 1 MB');
+      ).rejects.toThrow('A Snap interface context may not be larger than 5 MB');
     });
 
     it('throws if a link is on the phishing list', async () => {

packages/snaps-controllers/src/interface/utils.ts

@@ -396,7 +396,7 @@ export function constructState(
   return newState;
 }
 
-const MAX_CONTEXT_SIZE = 1_000_000; // 1 mb
+const MAX_CONTEXT_SIZE = 5_000_000; // 5 mb
 
 /**
  * Validate a JSON blob to be used as the interface context.