[code conduct] There are a lot of indents in the g4 files that shouldn't be there

[RaigorJiang]

According to Parser Conduct, blank line should have no indents https://shardingsphere.apache.org/community/en/involved/conduct/code/#contributor-covenant-g4-of-conduct

shardingsphere-parser-sql-mysql

shardingsphere-parser-sql-hive

[elysium-w]

@RaigorJiang I will finish it.

[RaigorJiang]

Assigned, thank you @elysium-w

[elysium-w]

Assigned, thank you @elysium-w

which branch should I submit this work to?

[RaigorJiang]

@elysium-w Please submit a PR for master, thank you! https://shardingsphere.apache.org/community/en/involved/contribute/contributor/