Support newline and separator tokens in plain SQL templates

[lukaseder]

As a part of this task:

• Support CTE column aliasing for plain SQL templates where this isn't supported #16629

I just wrote this plain SQL template in jOOQ's internals:

s = DSL.resultQuery("{0} union all {1}",
        select(map(name.fieldNames, n -> inline((Object) null).as(n))).where(falseCondition()),
        query
    );

The template was necessary because we can't place the query (a ResultQuery typed object) into a Select.unionAll(...) clause. Unfortunately, the formatting is now off:

with
  "cte" as (
    select null "c"
    where false union all select 1 "one"
  )
select "cte"."c"
from "cte"

It should be:

with
  "cte" as (
    select null "c"
    where false
    union all
    select 1 "one"
  )
select "cte"."c"
from "cte"

The unformatted version is fine, though:

with "cte" as (select null "c" where false union all select 1 "one") select "cte"."c" from "cte"

It would be cool if plain SQL templates had special placeholders for the usual Context.formatSeparator() and Context.formatNewline() semantics.