🚨📊 Cast kwargs as strings in plot_er

[vsocrates]

Closes #944

Description of the Change

• Cast all keyword argument values to strings in plot_er
• Enable passing a custom subtitle

Possible Drawbacks

May present some problems if the passed kwarg is a function or something that won't neatly be represented in the title as a string, maybe allow the user to pass in a custom title?

Verification Process

Release Notes

• Fixed crashes in plot_er when reducer kwargs aren't strings

[cthoyt]

Great! Might be more simple to use an f-string instead of the inner string join at this point

[cthoyt]

The pr title needs emoji in it too :)

[vsocrates]

Sounds good! Will update later tonight!

[cthoyt]

@PyKEEN-bot test

[cthoyt]

@PyKEEN-bot test

[cthoyt]

@vsocrates thanks for the update! I'd suggest future PRs you make branches off of the main branch on your fork so previous commits don't get mixed in. We use the squash+merge contribution model to keep our commit histories focused on high-level narrative

[vsocrates]

Will do, thanks for the f-string fix too!