Allow quotes in `sqlc.embed`

[tvallotton]

Version

1.29.0

What happened?

Hi, first off, thanks for the project! Secondly, at the moment sqlc.embed only allows identifiers in it, but it doesn't allow quoted identifiers, which are sometimes necessary. For example:

select sqlc.embed("user") from "user";

Which returns

test.sql:2:38: edited query syntax is invalid: syntax error at or near "user"

For this case user is a keyword in postgres so it needs to be quoted.