feat: Extend ARRAY_AGG to support ORDER BY

[MazterQyou]

This PR cherry-picks an upstream commit adding extended ARRAY_AGG syntax:
ARRAY_AGG([DISTINCT] <expr> [ORDER BY <expr>] [LIMIT <n>])
Related tests are included.

[coveralls]

Pull Request Test Coverage Report for Build 5027319512

• 54 of 66 (81.82%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.05%) to 89.495%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/dialect/mod.rs	1	2	50.0%
src/dialect/snowflake.rs	1	2	50.0%
src/ast/mod.rs	14	17	82.35%
src/parser.rs	27	34	79.41%

Totals
Change from base Build 3596717534:	-0.05%
Covered Lines:	8877
Relevant Lines:	9919

---

💛 - Coveralls