[9.0] feat: PoolCE takes care of RAM requirements #8366
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This is the same of #8232 but for 9.0 branch, plus the specification of RAM requirements was moved from GB to MB.
BEGINRELEASENOTES
*WMS
NEW: InProcessComputingElement takes RAM requirements into consideration for jobs' matching
NEW: PoolComputingElement takes RAM requirements into consideration when subdividing the pool
NEW: SingularityComputingElement can enforce CG2 RAM limits
ENDRELEASENOTES