feat: implement wildcard select ilike

[HiranmayaGundu]

Implements parsing for SELECT * ILIKE ... which is valid syntax in snowflake: https://docs.snowflake.com/en/sql-reference/sql/select

Via googling, it seems like only snowflake supports this syntax. I could not find any other dialect that does. Snowflake does not allow SELECT * ILIKE <pattern> EXCLUDE <column> so I implemented that as well.

[coveralls]

Pull Request Test Coverage Report for Build 8761418278

Details

• 39 of 44 (88.64%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 87.826%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/ast/query.rs	6	8	75.0%
tests/sqlparser_snowflake.rs	16	19	84.21%

Totals
Change from base Build 8726038305:	0.001%
Covered Lines:	20619
Relevant Lines:	23477

---

💛 - Coveralls

[jmhain]

lgtm!