WIP: Enable save solution with time intervals for SimpleIntegratirSSP

[amrueda]

No description provided.

[github-actions]

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[coveralls]

Pull Request Test Coverage Report for Build 7200650353

• 246 of 253 (97.23%) changed or added relevant lines in 34 files are covered.
• 2 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.008%) to 96.245%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/equations/ideal_glm_mhd_1d.jl	5	6	83.33%
src/solvers/dgsem_unstructured/sort_boundary_conditions.jl	0	1	0.0%
src/visualization/recipes_plots.jl	0	1	0.0%
src/solvers/fdsbp_unstructured/fdsbp_2d.jl	94	96	97.92%
src/time_integration/methods_SSP.jl	23	25	92.0%

Files with Coverage Reduction	New Missed Lines	%
src/callbacks_step/save_solution.jl	1	90.0%
src/solvers/dgsem_unstructured/sort_boundary_conditions.jl	1	91.11%

Totals
Change from base Build 6943953828:	0.008%
Covered Lines:	33754
Relevant Lines:	35071

---

💛 - Coveralls