Create an eslint rule to use memize not lodash's memoize

[tofumatt]

I didn't realise we should be using memize over lodash's built-in memoize, pointed out here: #6686 (comment)

I forget if we can make an eslint rule preventing us from importing it or at least warning us about it, but if so I'll make a PR so it doesn't happen again 😄

[aduth]

Potential implementation reference:

• https://eslint.org/docs/rules/no-restricted-syntax
• https://eslint.org/docs/developer-guide/selectors