Add GetFirstTable

[9999years]

Before submitting your PR, check that you've:

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

After submitting your PR:

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

[belevy]

Perhaps we should allow manual aliasing and make something like NamedTable @"p1" Person and then you could use the symbol to differentiate

[9999years]

@belevy That sounds very neat — how would users assign labels to each table?

[parsonsmatt]

Looks great! Let's bump version + @since annotations and get this out there