TrigL2MuonSA+TMMT: add AccumulatorCache for Muons

Add AccumulatorCache on l2MuFastAlgCfg and *AlgSequenceCfg. Reduces CA configuration time by ~130 seconds.

Relates to ATR-26996.

The relevant lines from the cache statistics:

----------------------------------------------------------------------------------------------------------
AccumulatorCache                                                       |    Hits (time) |  Misses (time) |
----------------------------------------------------------------------------------------------------------
TriggerMenuMT.HLT.Muon.MuonMenuSequences.muEFSAAlgSequenceCfg          |    329 (60.4s) |      2 (16.3s) |
TrigL2MuonSA.TrigL2MuonSAConfig.l2MuFastAlgCfg                         |    660 ( 7.4s) |      2 ( 0.9s) |
TriggerMenuMT.HLT.Muon.MuonMenuSequences.muEFSAFSAlgSequenceCfg        |     39 ( 7.4s) |      1 (10.6s) |
TriggerMenuMT.HLT.Muon.MuonMenuSequences.muFastAlgSequenceCfg          |    329 ( 6.3s) |      2 ( 2.4s) |

Trigger/TrigAlgorithms/TrigL2MuonSA/python/TrigL2MuonSAConfig.py

@@ -7,6 +7,7 @@
 
 from AthenaConfiguration.ComponentAccumulator import ComponentAccumulator
 from AthenaConfiguration.ComponentFactory import CompFactory
+from AthenaConfiguration.AccumulatorCache import AccumulatorCache
 
 
 # Get Rpc data decoder for MuFast data preparator
@@ -340,8 +341,8 @@ def AlignmentBarrelLUTSvcCfg( flags ):
 
     return acc, alignmentBarrelLUTSvc
 
-# In the future, above functions should be moved to TrigL2MuonSA package(?)
 
+@AccumulatorCache
 def l2MuFastAlgCfg( flags, roisKey, setup="", **kwargs ):
 
     acc = ComponentAccumulator()