Refactor operations (#184)

* Data sketch

* Units now available and grouped

* More units, towards formatting

* Units and accessors draft ready to begin tests on

* Some tests

* Work towards new data object

* Accessor changes

* Remove duplicate evaluate function.

* Removes duplicate code

* Fills out log operations

* Adds log evaluation tests

* Tidies up operations code

* Corrects derivative for Div operation

* Adds tests

* Refactors Log operation

* Ruff format

* Removes unnecessary file

---------

Co-authored-by: lucas-wilkins <lucas.wilkins@stfc.ac.uk>
Co-authored-by: James Crake-Merani <James.Crake-Merani@stfc.ac.uk>

Author: 3 people

.gitignore

@@ -41,6 +41,11 @@ venv
 tests.log
 /.pytest_cache
 
+# Unit test / coverage reports
+htmlcov/
+.coverage
+.cache/
+
 # Installer files
 /installers/build
 /installers/dist