MCMC Sampler Improvements

[BradyPlanden]

Description

This PR adds improvements and fixes to the BaseSampler and BasePintsSampler classes. Fixes incorrect attribute access between child/parent. End-user functionality hasn't been modified.

Issue reference

Fixes # (issue-number)

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.
• Noted any breaking changes, including details on how it might impact existing functionality.

Type of change

• 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

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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.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.26%. Comparing base (5281260) to head (b0dd16b).
Report is 42 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #692      +/-   ##
===========================================
+ Coverage    99.23%   99.26%   +0.03%     
===========================================
  Files           66       68       +2     
  Lines         4817     4896      +79     
===========================================
+ Hits          4780     4860      +80     
+ Misses          37       36       -1     

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[NicolaCourtier]

Looks good, thanks @BradyPlanden !

[martinjrobins]

looks great, thanks @BradyPlanden, just one minor type query