implement a janitorclass to automatically format class attributes

[ThomasHepworth]

Type of PR

• BUG
• FEAT
• MAINT
• DOC

Is your Pull Request linked to an existing Issue or Pull Request?

Follows on from #1642.

Give a brief description for the solution you have provided

Adds in a simple JanitorClass that automatically sets class attributes to upper case. This streamlines some of the SQLglot code and removes the need for a verbose try except clause to grab our quote identifiers.

If you think this is over-engineering the solution, then I shall scrap it!

Just to note, this can also be done with metaclasses with some inheritance magic. However, as SQLglot already makes use of metaclasses, I've just implemented a wrapper class that manipulates how attributes are pulled.

PR Checklist

• Added documentation for changes
• Added feature to example notebooks or tutorial (if appropriate)
• Added tests (if appropriate)
• Made changes based off the latest version of Splink
• Run the linter

[RobinL]

This is clever, but I guess maybe this is my lack of Python knowlege but it took me a little while to understand what this is doing.

On that basis, my view is:

• If implementing the JanitorClass (possibly better named UpperCaseAttributeWrapper or similar) was going to save us loads of lines of code elsewhere, then it's worth the complexity
• If (as it looks like) it saves only a small amount of conditionals in our code, then it might not be worth the complexity, especially since if we wait a bit, we can make sqlglot>16 a requirement, and then the class is no longer needed

[RobinL]

Have discussed with Tom - going to close this one because it possibly introduced a bit too much indirection