fix(optimizer)!: qualify functions with default columns and tables as column references

[geooo109]

Fixes #6358

This PR fixes the qualification of GENERATE_SERIES and table as column.

GENERATE_SERIES

SELECT * FROM GENERATE_SERIES(1, 2);
 generate_series 
-----------------
               1
               2
(2 rows)

In postgres GENERATE_SERIES creates a column generate_series, thus in order to safely qualify this we have the two following cases:

1. Without alias: we just create an alias on optimization time and use the default generate_series column:

SELECT generate_series FROM GENERATE_SERIES(1,2); => SELECT generate_series FROM GENERATE_SERIES(1, 2) AS _q_0(generate_series);

2. With alias: we wrap it with a generated alias from the optimizer:

SELECT g FROM GENERATE_SERIES(1,2) AS g; => SELECT g FROM GENERATE_SERIES(1, 2) AS _q_0(g);

Table projection
postgres supports:

SELECT t FROM t;

The type of t is record, which is an abstract type. We treat this case as the bigquerry table-column reference.

[georgesittas]

Great work @geooo109! This is breaking.