Add option to pushdown CTE aliases earlier in qualify

[dangoldin]

Based on Slack conversation with @barakalon we wanted to support the following valid Snowflake query:

WITH y (c) AS (
  SELECT 
    SUM(a)
  FROM (
    SELECT 1 a
  ) AS x
  HAVING c > 0
)
SELECT * FROM y

where the HAVING c > 0 is referencing the CTE alias c

[barakalon]

Nice PR!

Here's some examples of using the dialect attributes to customize optimizer behavior:
https://github.com/tobymao/sqlglot/blob/main/sqlglot/optimizer/simplify.py#L1095
https://github.com/tobymao/sqlglot/blob/main/sqlglot/optimizer/qualify_columns.py#L43

[dangoldin]

Nice PR!

Here's some examples of using the dialect attributes to customize optimizer behavior: https://github.com/tobymao/sqlglot/blob/main/sqlglot/optimizer/simplify.py#L1095 https://github.com/tobymao/sqlglot/blob/main/sqlglot/optimizer/qualify_columns.py#L43

@barakalon Just took a stab at it - let me know if this is what you intended here but I made it optional and default to what is set in the Dialect if not explicitly passed in.

[barakalon]

A couple more minor comments 👍

[dangoldin]

Addressed latest round of feedback - let me know if the docs are good. I may have over done it a bit.

[barakalon]

LGTM

I yield to Toby.