Adds support for SqlSqlToken as a memberType in sql.unnest (fixes #326)

[gajus]

• corrects invalid references to SqlToken when intention is SqlSqlToken
• adds support for SqlSqlToken as a memberType in sql.unnest

After these changes are released, if sql.unnest columnType array member type is SqlToken, it will inline type name without quotes, e.g.

await connection.query(sql`
  SELECT bar, baz
  FROM ${sql.unnest(
    [
      [1, 'foo'],
      [2, 'bar']
    ],
    [
      sql`integer`,
      sql`text`
    ]
  )} AS foo(bar, baz)
`);

Produces:

{
  sql: 'SELECT bar, baz FROM unnest($1::integer[], $2::text[]) AS foo(bar, baz)',
  values: [
    [
      1,
      2
    ],
    [
      'foo',
      'bar'
    ]
  ]
}

[coveralls]

Coverage increased (+0.04%) to 88.873% when pulling ffa7f6c on gajus/add-generate-type-name into 476a856 on master.

[gajus]

🎉 This PR is included in version 28.1.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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