add generic manager to simplify typecasts

[trajan0x]

Switch typecast files to use generics

[codecov]

Codecov Report

Patch coverage: 78.78788% and project coverage change: -0.04102 ⚠️

Comparison is base (eebe9ea) 44.12105% compared to head (93a3a8c) 44.08003%.

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master        #692         +/-   ##
===================================================
- Coverage   44.12105%   44.08003%   -0.04102%     
===================================================
  Files            486         486                 
  Lines          40679       40583         -96     
  Branches         174         174                 
===================================================
- Hits           17948       17889         -59     
+ Misses         20622       20595         -27     
+ Partials        2109        2099         -10     

Flag	Coverage Δ
agents	59.01156% <100.00000%> (-0.45273%)	⬇️
ethergo	43.92316% <0.00000%> (+0.12232%)	⬆️
explorer	44.13750% <100.00000%> (-0.15280%)	⬇️
omnirpc	64.23017% <ø> (+0.23328%)	⬆️
scribe	34.50114% <100.00000%> (+0.13432%)	⬆️

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Impacted Files	Coverage Δ
ethergo/manager/manager.go	60.22727% <0.00000%> (-5.20484%)	⬇️
agents/testutil/typecast.go	100.00000% <100.00000%> (ø)
...rvices/explorer/testutil/testcontracts/typecast.go	100.00000% <100.00000%> (ø)
services/explorer/testutil/typecast.go	100.00000% <100.00000%> (ø)
services/scribe/testutil/typecast.go	100.00000% <100.00000%> (ø)

... and 12 files with indirect coverage changes

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