random_search optimiser added in the pints framework

[Dibyendu-IITKGP]

Description

Add a simplistic random search optimiser, with the following API:
optim = pybop.RandomSearch( cost, max_iterations=1000, max_unchanged_iterations=100, population_size=50)

Issue reference

Fixes #440

Review

Before you mark your PR as ready for review, please ensure that you've considered the following:

• Updated the CHANGELOG.md in reverse chronological order (newest at the top) with a concise description of the changes, including the PR number.
• Noted any breaking changes, including details on how it might impact existing functionality.

Type of change

• [x ] New Feature: A non-breaking change that adds new functionality.
• Optimization: A code change that improves performance.
• Examples: A change to existing or additional examples.
• Bug Fix: A non-breaking change that addresses an issue.
• Documentation: Updates to documentation or new documentation for new features.
• Refactoring: Non-functional changes that improve the codebase.
• Style: Non-functional changes related to code style (formatting, naming, etc).
• Testing: Additional tests to improve coverage or confirm functionality.
• Other: (Insert description of change)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All unit tests pass: $ nox -s tests
• The documentation builds: $ nox -s doctest

You can run integration tests, unit tests, and doctests together at once, using $ nox -s quick.

Further checks:

• Code is well-commented, especially in complex or unclear areas.
• Added tests that prove my fix is effective or that my feature works.
• Checked that coverage remains or improves, and added tests if necessary to maintain or increase coverage.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.20%. Comparing base (c8b00e6) to head (753a6de).
Report is 45 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #580      +/-   ##
===========================================
+ Coverage    99.08%   99.20%   +0.11%     
===========================================
  Files           52       60       +8     
  Lines         3605     4376     +771     
===========================================
+ Hits          3572     4341     +769     
- Misses          33       35       +2     

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[BradyPlanden]

This is looking really good @Dibyendu-IITKGP! A few comments and suggestions to align this class with the others.

[BradyPlanden]

Can you also add a changelog entry :)

[BradyPlanden]

Three small changes to the unit test addition, then I think we are good 🎉

[BradyPlanden]

@all-contributors
please add @Dibyendu-IITKGP for test.

[allcontributors]

@BradyPlanden

I've put up a pull request to add @Dibyendu-IITKGP! 🎉

[BradyPlanden]

@all-contributors please add @Dibyendu-IITKGP for code.

[allcontributors]

@BradyPlanden

I've updated the pull request to add @Dibyendu-IITKGP! 🎉