Add 'hash' object cache for installer

It's used to e.g. cache less files in ResourceLoader, which would throw
an exception if the installer is used (while it requests the installer
styles), if the object cache isn't defined.

Follow up: I1ff61153ddb9

Bug: T113843
Change-Id: I1c1938b3fac395dda5b42dd68b675a67bdd30261