Securely should consider a redesign of how it exports access to frozen intrinsics

[weizman]

Currently Securely exports a callback that grants access to desired intrinsics.

This decision did not take into consideration that doing operations like securely(() => anArrayProvidedByAnAttacker.sliceS()) is not really secured.

Without being able to run such operation we're left with a small amount of operations that are safe to use under current design of

Securely that no longer justify the securely callback design decision.

Instead we should consider having Securely simply export a bag of intrinsics from the Securely realm (and also have it frozen #1)