Introduce report benders iters

[manuelma]

Introduce report_benders_iters to report results of all iterations.

Checklist before merging

• [x] Documentation is up-to-date
• [x] Unit tests have been added/updated accordingly
• [x] Code has been formatted according to SpineOpt's style
• [x] Unit tests pass

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.19%. Comparing base (1f08a3e) to head (0d433cf). Report is 2 commits behind head on v0.7.2.x-release.

Files with missing lines	Patch %	Lines
src/run_spineopt_basic.jl	83.33%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v0.7.2.x-release #1089 +/- ## ==================================================== - Coverage 86.21% 86.19% -0.02% ==================================================== Files 141 141 Lines 3721 3724 +3 ==================================================== + Hits 3208 3210 +2 - Misses 513 514 +1 ```

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