Added Adaptive LADMM and unit test

[ljlozenski]

Description

Added penalty parameter variable for linearized/proximal ADMM and adaptive penalty parameter method. Can be utilized for fast solves of constrained optimization problems with simple proximal, ie can solve TV problems faster base PDHG.

#2264

Example Usage

     alpha = 1
    K = alpha*GradientOperator(ig)
    G = MixedL21Norm()
    F = L2NormSquared(b = noisy_data)
    num_iters = 100

    admm = LADMM(f = F, g = G, operator = K, rho = 1e0, mode = 'adaptive')
    admm.run(num_iters)

Contribution Notes

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