Simplify ListOfConstraintTypesPresent in Bridges

[odow]

Big reduction in the amount of compiled code and the elimination of a type instability (the compiler couldn't prove the type in map due to FS....

Before

julia> using MathOptInterface

julia> const MOI = MathOptInterface
MathOptInterface

julia> using GLPK

julia> model = MOI.Bridges.full_bridge_optimizer(GLPK.Optimizer(), Float64)
MOIB.LazyBridgeOptimizer{GLPK.Optimizer}
with 0 variable bridges
with 0 constraint bridges
with 0 objective bridges
with inner model A GLPK model

julia> @time MOI.get(model, MOI.ListOfConstraintTypesPresent())
  1.158660 seconds (3.68 M allocations: 215.417 MiB, 12.50% gc time)
Tuple{DataType, DataType}[]

julia> @time MOI.get(model, MOI.ListOfConstraintTypesPresent())
  0.000021 seconds (11 allocations: 1.016 KiB)
Tuple{DataType, DataType}[]

After

julia> using MathOptInterface

julia> const MOI = MathOptInterface
MathOptInterface

julia> using GLPK

julia> model = MOI.Bridges.full_bridge_optimizer(GLPK.Optimizer(), Float64)
MOIB.LazyBridgeOptimizer{GLPK.Optimizer}
with 0 variable bridges
with 0 constraint bridges
with 0 objective bridges
with inner model A GLPK model

julia> @time MOI.get(model, MOI.ListOfConstraintTypesPresent())
  0.896201 seconds (2.82 M allocations: 162.893 MiB, 13.97% gc time)
Tuple{DataType, DataType}[]

julia> @time MOI.get(model, MOI.ListOfConstraintTypesPresent())
  0.000007 seconds (5 allocations: 688 bytes)
Tuple{DataType, DataType}[]