Switched to Aux in the MutableMTJ

Tomasz Boldrequested to merge
tbold/athena:switch-to-aux-stores-in-mtj-2 into main

This MR changes implementation of MutableMJT (most heavily used) to talk direcetly to Aux containers. Followups thet will be added soon: const MTJ will talk to the Aux as well, TrackStorage* to talk to the backends as well, decorations support need rewriting (will be easier in fact).

Edited by Tomasz Bold

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