Add docs with examples on why Dualization is useful

[odow]

The JuMP docs now have a simple Dualization tutorial: https://jump.dev/JuMP.jl/dev/tutorials/conic/dualization/

But a deeper discussion on the primal/dual formulations and specific solvers is a but out of scope. However, the docs here can go into the weeds and explain the different internal formulations.

See https://github.com/jump-dev/JuMP.jl/pull/3408 See https://github.com/jump-dev/JuMP.jl/pull/3416