Adds support for IDAKLU w/ output variables

[BradyPlanden]

Description

Add support and testing for different pybamm solvers. Includes examples for users to benchmark the different solver for selection of the best on their hardware and situation.

Issue reference

Fixes #160

Review

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• Updated the CHANGELOG.md in reverse chronological order (newest at the top) with a concise description of the changes, including the PR number.
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Type of change

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• Optimization: A code change that improves performance.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.67%. Comparing base (d68a70d) to head (65c1c6c).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #450      +/-   ##
===========================================
+ Coverage    98.51%   98.67%   +0.16%     
===========================================
  Files           46       47       +1     
  Lines         2960     3025      +65     
===========================================
+ Hits          2916     2985      +69     
+ Misses          44       40       -4     

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[NicolaCourtier]

I added a couple of small comments and a question, but otherwise this looks great! Thanks @BradyPlanden

[agriyakhetarpal]

Thanks, @BradyPlanden!