Add customisation of auto-gen'ed SQL record names

[ivanbakel]

This adds an Aeson-inspired ability to configure how deriveEsqueletoRecord generates the SQL record type, in particular which names it generates for the record type itself and its fields.

This is because DuplicateRecordFields is a painful extension to use, and avoiding it through module structuring is also painful. A nicer solution for avoiding duplicate record fields is to simply not generate them, and allow the user to specify how record fields should be generated so they don't overlap.

Before submitting your PR, check that you've:

• [x] Bumped the version number.
• [x] Documented new APIs with Haddock markup.
• [x] Added @since declarations to the Haddock.
• [x] Ran stylish-haskell and otherwise adhered to the style guide.

After submitting your PR:

• [x] Update the Changelog.md file with a link to your PR.
• [x] Check that CI passes (or if it fails, for reasons unrelated to your change, like CI timeouts).

[parsonsmatt]

released as 3.5.8.0