Allow defining custom quote types

[verhovsky]

Describe the Feature
Allow defining a custom quote type for a dialect.

Why do you want this feature?
As I explained in #306, I would like to define a custom grammar of Trino SQL queries + {{Handlebars templates}} so that users can write (and format with sql-formatter) queries like this

select
  {{ country_code }}
from
  my_table

and we could render the query for other users with a dropdown in place of {{ country_code }}. The easiest way to do this is to make make sql-formatter treat {{}} like a type of string. In order to do this, we need to have a regex for this type of quote in quotePatterns. It makes no sense to add this to sql-formatter itself, so we have to fork it to add this custom quote type. It would be nice if I could pass the regex somehow through DialectOptions' tokenizerOptions.stringTypes or some other way.

[doncote]

we're looking to allow formatting with handlebars style templating as well.

[nene]

This is now supported with the following API:

stringTypes: [
  { regex: "your regex here" }
]

Available in 12.0.0-beta.5 release.