[WIP]: Add asv benchmarking

[BradyPlanden]

This PR does the following:

• Adds Airspeed Velocity benchmarking suite
• Adds initial benchmarking suite

Closes #179.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.29%. Comparing base (2b238e4) to head (2013161).
Report is 1 commits behind head on develop.

Additional details and impacted files

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##           develop     #207   +/-   ##
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  Coverage    94.29%   94.29%           
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  Files           33       33           
  Lines         1753     1753           
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  Hits          1653     1653           
  Misses         100      100           

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[BradyPlanden]

This should be ready for a review now. Since it adds a new workflow, I can't manually trigger until the workflow is added to develop. I'll apply a patch to fix any bugs once this has been merged.

[agriyakhetarpal]

That was fast, thanks @BradyPlanden! The benchmark suite looks great, I have a number of suggestions – but besides them, I would also suggest setting a fixed random seed, similar to what PyBaMM does:

import numpy as np

def set_random_seed(seed_value=42):  # or anything you like
    np.random.seed(seed_value)

in the ParameterisationBenchmark.setup() method in parameterisation_benchmark.py, or in a benchmark_util.py shim file; as you like it.

[agriyakhetarpal]

Now the benchmarks are proceeding to run, nice!