Add mpsAvoidHsKeyword in MkPersistSettings

[ccycle]

This PR adds an option in MkPersistSettings to customise function for field accessors applied only when the field name matches any of Haskell keywords. (inspired by @parsonsmatt 's comment in #1476 (review))

Before submitting your PR, check that you've:

• Documented new APIs with Haddock markup
• Added @since declarations to the Haddock
• Ran stylish-haskell on any changed files.
• Adhered to the code style (see the .editorconfig file for details)

After submitting your PR:

• Update the Changelog.md file with a link to your PR
• Bumped the version number if there isn't an (unreleased) on the Changelog
• Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts)

[parsonsmatt]

This is great, thanks! Mind doing a minor version bump?

[ccycle]

@parsonsmatt Thank you, I added a change to bump minor version.