Add primary key, generated column reserved phrases

[karlhorky]

Add reserved phrases for PostgreSQL for primary keys and generated columns

After this change, the formatting results in the common style in the ecosystem:

CREATE TABLE animals (
  id integer PRIMARY KEY GENERATED ALWAYS AS IDENTITY
);

Before, the following configuration would result in the mixed lowercase for KEY, GENERATED, ALWAYS, and IDENTITY:

CREATE TABLE animals (
  id integer PRIMARY key generated always AS identity
);

Config (attempt to match style of official PostgreSQL docs):

{
  language: 'postgresql',
  keywordCase: 'upper',
  identifierCase: 'lower',
  dataTypeCase: 'lower',
  functionCase: 'lower',
}

This was caused by the PostgreSQL keywords being removed in:

• https://github.com/sql-formatter-org/sql-formatter/issues/709

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[nene]

Thanks.

[karlhorky]

Glad to help, thanks for the review and merge 🙌