[Aptos framework] Aggregator V1

[georgemitenkov]

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Description

Followed by discussion with @zekun000 and @gelash, I changed old aggregator PR (see #1836) to be a weaker but simpler Aggregator version.

In particular, this V1 implementation allows us to have:

• Main Move logic for Aggregator usage
• Baseline Aggregator native implementation that supports adds, reads (as barriers), subs (barriers: read followed by a sub)

This is intended to be landed after #2222 (delta ops are reused), followed by executor support. Once it's done, pieces can be connected together to have end-to-end pipeline with Aggregator being used for gas fees (here we are interested in additions).

Test Plan

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This change is