Add nullable, key, default to GLUE_TABLE_COLUMNS

[devgony]

Goal

gluesql> CREATE TABLE T1 (id INT PRIMARY KEY, name TEXT NULL);
Table created

gluesql> CREATE TABLE T2 (id INT UNIQUE DEFAULT 0 NULL);
Table created

gluesql> SELECT * FROM GLUE_TABLE_COLUMNS;

gluesql> SELECT * FROM GLUE_TABLE_COLUMNS;

TABLE_NAME	COLUMN_NAME	COLUMN_ID	NULLABLE	KEY	DEFAULT
T1	id	1	FALSE	PRIMARY KEY
T1	name	2	TRUE
T2	id	1	TRUE	UNIQUE	0

Todo

• add nullable, key, default to GLUE_TABLE_COLUMNS

[coveralls]

Pull Request Test Coverage Report for Build 4900727223

• 26 of 26 (100.0%) changed or added relevant lines in 2 files are covered.
• 13 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.03%) to 98.986%

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Files with Coverage Reduction	New Missed Lines	%
core/src/executor/fetch.rs	13	97.06%

Totals
Change from base Build 4900246167:	0.03%
Covered Lines:	44333
Relevant Lines:	44787

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💛 - Coveralls

[panarch]

Looks all nice!
Thanks a lot 👍